I've asked for an Android Phone app that shows caller context, but then I realized it would be simpler to make (and thus with a higher probability of already having been made) a way to add contacts temporarily to a phone's Contacts List, such that I would add the person now and it would be deleted after a month or so (perhaps ideally I would define that term when adding the contact).
Actually, just a way to separate "permanent" contacts from transactional with a quick-add and quick-delete options would be sufficient for the job.
I would rather pay, say, 10/15 bucks than use an app full of ads and trackers.