How do I set up karaoke on Roku TV and Roku wireless speaker?

We like using YouTube on our Roku TV (with Roku wireless speakers) for karaoke - the big screen allows everyone to see the lyrics and sing along and gives our family room a "karaoke box" vibe. However, to this point, we have dealt with playing the karaoke audio through the TV and have a little mics-and-amp portable karaoke set for singing through. It works, but I would love it if there were an elegant solution for us to play both the YouTube videos (or perhaps a dedicated karaoke channel/app) and mic audio through the TV and Roku wireless speakers (even if it means connecting some sort of mixer or receiver into the TV for the mics).

Hoping someone has managed to do this and can share knowledge! Tia!