Gay content is generally found mostly on PC, where indie developers can self-publish easily without being vetted by Sony or Nintendo. I'm afraid the gay pickings for PS4 are very slim indeed.
I think you are aware of Dragon Age Inquisition. Stardew Valley is one of those PC indie games that has been ported to PS4. It's a Harvest Moon style farming sim with some combat and crafting. There are skills to be leveled up. You probably at least heard of it. All bachelors are available for male and female player characters. So in the sense that they are treated equal it's positive. Instead of getting pregnant gay couples can adopt children.
The Technomancer is of those janky games between big publisher AAA and small indie. You play as the titular Technomancer Zach and you can have a relationship with a fellow Technomancer called Andrew.
Gameplay is a lock-on, mostly melee dodge/block, strike action type, though I mostly just stood back to spam electric Technomancer powers. I've played the original version which was a bit difficult at the beginning, then got easier as I progressed, but become bullet sponge hard towards the end. It's since been patched of course. It's not a game for everyone.
For world, story and characters it's like a scaled down Mass Effect or Dragon Age but before the new open world generation. It's an extremely rare case of two fully animated guys making out in a game. You can't play a female character so this relationship is strictly gay, not a gender-neutral one designed to fit males and females. Id's say in terms of positive portrayals of homosexuality it's a standout.
There are just a few other PS4 games with gay content, like Fallout 4. You start the game in a straight marriage and the main quest sends you to go looking for your son. Male characters can have relationships with male followers but those also mention stuff like dead wives, never dead husbands. It's very much by grace of the developers, who were nice enough to allow gay stuff, but they didn't really care too much about it.
Plus the game is not a RPG anymore. It really has turned into a dull shooter. Dialog options are very limited thanks to a voice acted player character who cut into the voice acting budget so much for no real benefit. Skills no longer exist. Fallout New Vegas had perks that not just allow special heterosexual dialog options, but another perk that let you be effectively gay. Fallout 4 has only the heterosexual versions again.
It's a complete disregard of the vision of the gay original creator of Fallout, who values player choice and exploring the morality of a postapocalyptic world over just shooting everything. I think it's a bad game in itself and homosexuality is very much a step backwards from Fallout: New Vegas which had multiple gay character in it's huge cast, one of them was even a follower. None of that is in Fallout 4. But that's just my opinion.
Mass Effect Andromeda is another game with gay relationships, but it too is not a good game. It's horrendously incomplete after a rushed 18 months development when the original plans for producerally generated planets finally had to be axed after years of trying to make it work.
Relationships were also cut down in the rush. As per usual straight guys still got 3 big and 2 small options. Straight women and lesbian got a bit less and gay guys were left with 2 tiny options.
It's filled with bugs and glitches. The worlds are not small, but big and empty. What is there is busy work.
Gameplay is almost as good as Mass Effect 3. For me personally it's slightly worse because you are only allowed to map 3 powers at the same time. You can switch to different, customizable sets of powers, but then everything goes on cooldown before you can use it, and cooldowns never go so far down as in Mass Effect 3.
The Last of Us was remastered for PS4. One of the side characters is gay. He is often described as this guy who manages to survive alone against the zombies. I've seen people gay and straight praise him for not being in your face gay. What I see is that him being gay is only implied, it's very much possible to fly over players heads unless they're paying attention and he's also a loner living outside of society, he has mental health issues. I wouldn't necessariy count his as a positive portrayal of homosexuality so much as a nuanced or neutral portrayal but of course plenty of people disagree.
As for the game itself it makes for a good movie but gameplay is your bog standard 3rd person stealth action shooter with perfectly acceptable Naughty Dog polish. The linear story where you don't have any control is the real strength.
Masquerada Songs and Shadows is another indie that has been released for PS4. I know it has a gay follower. As I recall his story was about being struck from history for not producing children. Player character is straight, no gay relationship for him. It was made in Singapore, which of course is homophobic, authorities there tried to shut the game down and ban it. I ultimately never played very far because it's very linear and some basic RPG features were missing in my opinion.
I've heard Horizon Zero Dawn has a very small side quest about a gay widower. I haven't played it.
The Sims 4 has same-sex marriage as usual.
I know Mafia 3 had a gay bad guy who is killed by the player character. Needless to say there is no gay good guy.
There is probably more for PS4 but that's all I know and can think of right now. Like I said gay content is mostly on PC.