How to send data from Firebase (RealTime) to a function?

Hey guys! Howdy friendy?

I'd like to know how to get data from Firebase (RealTime) at least from 2 variables and send trhem to a function, and then, take the variables and plot a graph (bar or pie, whatever). I have ever installed the pallete node-red-contrib-firebase, and I can get data from my Firebase RealTime. I don't get to plot my data on a graph. Anyone can helo, pls! Thanks!

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