[Feature]: Subscription Compatibility

[therealresonix]

Type of request

New feature

What problem would this solve?

Switching between alternative Front & Backends would be possible.

Is not possible / blocked by #172

What would you like to see?

• Import data from Invidious subscription format
• Export data to Invidious subscription format
• Import data from Piped subscription format
• Export data to Piped subscription format
• Others

Area

Not sure