I use jerboa. Can someone tell me how to do that? Or suggest an app with such feature?

There’s a feature request here to make this into a more obvious setting, and here to stop counting your own posts as read, plus more ideas here.

I’d like a hide post button. I sometimes want to hide posts, but not usually ones I’ve interacted with.

Hm but then you won’t see that the post you were engaging with had new comments since your last visit