Feature Request: Airdrop/Nearby Share downloaded maps!

[ijustlovemath]

I love this app, but sometimes I find myself outside service range with my hiking partner, and would like to share maps with them. You can already do this with bookmarks on Android, so it would be great to be able to do this with downloaded maps as well

I understand there may be version differences, but perhaps there's a minimum supported feature set that is common between map versions that could be translated?

[j5k]

@ijustlovemath see #14157