Unfortunately not possible based on previous feature requests like this one
I have a similar zoning issue with our driveway - we want notifications for the driveway but not for the pavement running alongside it - that I’ve resolved by adding a deepstack image processing docker container into the mix. Custom component repo is available in HACs.
The added bonus for us is that Deepstack doesn’t detect our parking posts as people at around if it’s sunny (something to do with shadows I think).
This gives a flow something like this:
Protect Motion > HA automation > Deepstack Scan > Event driven HA automation > notification.
Using the protect integration cameras and JPG image format from Deepstack adds about 2 seconds in total to reaction time on a NUC5CPYH running multiple docker containers on Ubuntu 18.04.