Actually I want to add to this question:
On pc can I use a combination of controller and keyboard?
I want to explore with a controller and use my keyboard and mouse for combat.
I mean they must implement controller support for the PS5 and the eventual possible Xbox release so I'm assuming they'll also have controller support on PC. As for whether you can use controller and keyboard/mouse at the same time I don't know...maybe.
As for the OPs question, I don't think so. I don't believe the PS5 supports keyboard and mouse. I play mostly on PS5 and I never heard of any game having keyboard and mouse support on there.