Checklist

• I made sure that there are no existing issues - open or closed - which I could contribute my information to.
• I'm aware that this is a request for NewPipe itself and that requests for adding a new service need to be made at NewPipeExtractor.
• I have taken the time to fill in all the required details. I understand that the feature request will be dismissed otherwise.
• This issue contains only one feature request.
• I have read and understood the contribution guidelines.
• I have read the FAQ and my problem isn't listed.

Feature description

The Title basically sums it up, just add the Subscription Imports/Exports function to the Settings/Backup and restore menu, too.

Why do you want this feature?

I wanted to transfer my newpipe subscriptions from the phone to smarttube on the TV, but I ran into some issues.

I would have expected the export button for the subscriptions to be in the Settings/"Backup and restore" section,
instead I had to google it, and it was hidden in the hamburger menu of the subscriptions section. (imho it's also ok to have it there, but it was not the first place where I was searching, as I find having it in the Settings/"Backup and restore" section is more logical).

(On a side note: The newpipe faq mentions it, too https://newpipe.net/FAQ/tutorials/import-export-data/
tho the screenshots are a bit outdated ...)

Additional information

There was quite some discussion on that feature for smarttube, too:
yuliskov/SmartTube#4260

I still haven't found the import button there, but the dev said, it's going to get added to their settings/backups menu.

So I'd be nice to have these 2 things consistent across the apps.