This is funny, but I think stereotypical vampire lore still stands. I think it’s only direct sunlight that is an issue. If a vampire stands in a room with an open window, but off to the side, they’re generally considered fine. If light reflected off a wall is ok then why is the moon not?
Sadly this is probably impossible at this point. Before their whole fiasco discontinuing the desktop app there was a procedure I did where I was able to download a super old version of the desktop app and use Chrome to get into the dev interface (or something like that) of the app, then use a script someone made to export everything. Maybe if you search around you can find some way to do this with the mobile app, but I am not optimistic.