Easiest way is to dig into the model object in your browser console.
This will show all the conditions on the model. Including the filterable ones. Each condition has a value or values node that shows what the current value of the condition is.
You could make a snippet where that is retrieved as a variable, and then printed in a console.log statement. And then change the renderer on your field to be "custom" (with the name of the snippet you just created).