Linking Selected Values from Slicer based on Field Parameters with Dynamic Text in Textbox Visual

[Anonymous]

Dear All,

A few days agao, I posted a question of using the field parameter to create a measure for dynamic title of chart visuals.

https://community.fabric.microsoft.com/t5/Desktop/Using-Fields-Parameter-to-Create-a-Measure-for-Dyn...

I just came across a similar problem related to the same project. I would like to have a Textbox displaying the detailed definition of the selected "field parament" value.   In the screenshot below, the slicer is based on a field paramenter that include over a dozen created measuresm, including "Number of Referrals". I have created a DAX measure to display the dynamic title in the Bar Chart as well as in the TestBox title.    

However, I would also like to display the definition of the selected measure/value in the slicer in the TEXTBOX. I originally did all the visuals through creating a separate table with list of the measures and definitions, and a Switch measure that links the the List to the the original Measures. Now since I have used the Field Parameter (with the orginal measures) for the slicer, the visual Y axis and dynamic titles, I don't know how I can link the separate table of measures and definitions with the selected Field Parameter values, so that I can display the definition of the selected measure dynamically in the TextBox. 

Right now although the TextBox title is dynamic with the slicer, the definition in the textbox is not.   

Your advice will be greatly appreciated.       

dasf