[Feature Request] Support json / ndjson for message import

[teambvd]

The FOSS alternative to the play store SMS backup app, SMS Import/Export is relatively popular amongst self-hoster types, and backs up SMS/MMS as json/ndjson as opposed to xml.

It'd be great if the messagevault app included support for importing such backups, and I think the uptake would be pretty decent as well given both nextcloud and the sms import/export app cater to fully self-hosting users.

Appreciate your work, and thanks for any consideration!

[onfire4g05]

Love it. I hadn't come across this before, though I needed RCS support, so that could be why. Going to add to the list to get integrated, I definitely want more backup apps added and this looks like a great one.