Great questions @Roberto Quezada. I'd also be interested to hear from the community! From the interviews I've done so far, PE teams seem to be quite diverse - how each team is made up is dependent on the context of the org and teams within in (eg. org size, engineering maturity, scale of software, etc).
I'd love to hear about the evolution of your PE team (how it was initially structured versus how it's structured now?). If you're interested, you can sign up for a chat using the link above. Alternatively, you could tell me more about it in this thread 🙂