Allow to customize the text trnsmitted to the Android share feature using a template

[christophehenry]

Feature request

Which Nextcloud Version are you currently using: I don't know (payed service)

Is your feature request related to a problem? Please describe.

I'm used to share a lot a vulgarisation content on social platforms using a specific format. Right now I'm using a client that I developed so I wrote that feature myself. Due to lack of time, I can no longer develop this client myself, so I'm migratin to Nextcloud News, which seems to meet my needs well overall, except for this feature.

I'm ready to add it to NC News if you'll accept it.

Describe the solution you'd like

Add a setting allowing to configure what text is shared using the Android share feature, using a template engine like Mustache using a Java or Kotlin implementation.