It depends on the system you have. I have a couple of Amazon Echo Show and I can say "Alexa, show my driveway" and it will stream it live for about five minutes.

I don't know about other systems.

Yes I have the same "Alexa show me front door" On my phone I get both locations showing on the screen and click on them for live.

I have not done extensive research but this bloke seems to have created a work around will give it a go when I have time

https://www.youtube.com/watch?v=MJ8qptPprUc&t=91s