What about a custom website provider

[RainbowShatter]

Checklist

• [X] I made sure that there are no existing issues - open or closed - which I could contribute my information to.
• [X] I have read the FAQ and my problem isn't listed.
• [X] 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.
• [X] I have taken the time to fill in all the required details. I understand that the feature request will be dismissed otherwise.
• [X] This issue contains only one feature request.
• [X] I have read and understood the contribution guidelines.

Feature description

it should have the option to put spotify and other custom services on tubular

Why do you want this feature?

Because it can get very cool and also pretty important to access content from bitView, spotify and other without an account the same way it has soundcloud and framatube

Additional information

No response