[gaspoweredcat]

Plex or a similar service would potentially meet your needs however im not sure if it supports google music, they do have tidal integration and ive used it to stream my own self hosted flac files back when i had unlimited data and it worked pretty well,

if memory serves i streamed both from files stored on google drive and on my home PC with it (i just have a huge SD card now so i just keep files local rather than stream