On Google Calendar, you can create a type of event called “Focus”, which let’s people know you’ve blocked off the time to do deep work and not be disturbed (in fact some apps listen to these and put themselves into do not disturb too)
Admittedly, the Google Calendar Android app lets you edit but not “create” Focus events, leads me to believe it’s not well supported by Google themselves, but it would be great to use this feature with Legend, so I can drag tasks directly in to the focus blocks as seen on Legend