You can access Spotify for Innuos via a third party app, which is also the case with Qobuz that you need to access through mconnect HD that I actually prefer because it is very similar in layout/function to the Qobuz site so very low learning curve. Think it would be a similar experience with Spotify, and here’s how to get it to work…
https://innuos.com/kb/configure-the-spotify-streaming-service-innuos-2-0/