Spotify songs download in Apple watch series 6

I had a dream of running without any equipment except my Airpods pro and a future Apple watch.

Recently I bought an Apple watch Nike series 6 to run without my iPhone 11 pro max.

I downloaded Spotify App to the watch, but I can't find the "download" option for offline use.

I do not have a cellular watch, but a wifi one, and I want to use it without any network connection.

PS: I understand that Apple music does support downloading songs for offline use, so why Apple does not support this feature in Spotify?

Please help me to achieve my dream :)

Thanks, Roni.