Finamp on your phone does this really well.

I'm sure a plugin exists. If it doesn't, we're in a fascinating age of compute where you could add it yourself in a just a few prooompts

not sure

Let me do it through my settings because I'm pretty sure mine just does that.

On the Jellyfin app (Android) there is a circle icon with a slash through it next to the play icon. If you tap it creates an "instant mix" playlist related to your current song, album orc artist.