Hello
This option, in my opinion, it would be a plus that Poweramp had support for the cloud ( dropbox, gdrive, webdav, etc... ), because now anyone with a little knowledge and ( at least a raspberry ) can have a server at home ( I have one ) with the music I like and so you can listen directly to the music if you have to pass it to the mobile. This is the future ( example is Spotify ).
And it would be a blast to support the airsonic api ( but it is an option that I have already seen that has been commented in the forum ).
It would be a very good option to take into account for the not too distant future.