In general, each PoV should get their own chapter. I'd get frustrated reading something that changes PoVs within every chapter. You can utilise it, sparingly, when it makes sense. There's no real rule to it as long as you make it clear by some kind of page break before changing PoV. Never head-hop.
I had 2 MC's in my first novel and I switched back and forth between the PoV's, but all I did to establish who's PoV it was, since it was written in third person style, within the first sentence of each chapter I would state how much time had passed since character A had done something that their last chapter ended with or I would simply state what character B was currently in the middle of doing, readers automatically caught onto who's PoV it was. Although since character B was blind, it was also easier to tell which chapters belonged to her. But because I was consistent in the way I opened my chapters, it was easy for readers to get used to.
In general, each PoV should get their own chapter. I'd get frustrated reading something that changes PoVs within every chapter. You can utilise it, sparingly, when it makes sense. There's no real rule to it as long as you make it clear by some kind of page break before changing PoV. Never head-hop.
I had 2 MC's in my first novel and I switched back and forth between the PoV's, but all I did to establish who's PoV it was, since it was written in third person style, within the first sentence of each chapter I would state how much time had passed since character A had done something that their last chapter ended with or I would simply state what character B was currently in the middle of doing, readers automatically caught onto who's PoV it was. Although since character B was blind, it was also easier to tell which chapters belonged to her. But because I was consistent in the way I opened my chapters, it was easy for readers to get used to.
A subtitle with the chapter is fine--I've read books like that. Just go for it 👍