Possible to sideload applications?

I see that Rose amplifiers are equipped with a customised Android system, which Android support sideloading. I wonder is there a way to sideload an application to the amplifier?

I’m using Jellyfin & Plex but they aren’t in the same LAN network as the rose amplifier I have. Though they are port forwarded which means it can be used externally.

The current state of the operating system doesn’t support neither Jellyfin or Plex yet and I just couldn’t wait to use it. I would want to sideload their TV client into the amplifier as a temporary solution for now.

So, is it possible? If so, how? Thanks.

This would be amazing, but unlikely since Rose works with Roon.