Here's an article from Inovelli on the topic -- it mentions both Rule Machine (RM) stuff and a community-developed Hubitat app called "LED Mini Dashboard". I think that Mini Dashboard app still works, but it's unfortunately no longer being supported -- the developer left the Hubitat platform quite a while ago.
I used that app when I first installed my Blues long ago, but I swapped everything over to RM earlier this year... That Inovelli article gives a good start/intro as to the basics of managing the LED bar in RM, but it still took me a while experimenting how to fine-tune the available RM options, but now I'm happy I did -- I've found RM to be more flexible than that app.
Here's one of my posts from earlier this year where I show a few examples of my rule builds.
