Some features of this extension have been added in-product as of 2020.1
This extension allows you to add a parameter to a Tableau dashboard whose domain is based on your data. Added a new product line? No longer do you need to manually edit the parameter to update it, with this extension your parameter values update automatically!
Create an open input (All) parameter with a data type matching the field you want to use to populate it.
Drag in this extension.
Select the parameter you created above for the extension to manipulate.
Select the worksheet that holds the field you want to base your parameter on.
Select the field you want to base your parameter on.
Optional: Configure your text and background colors.
Note: You can add as many instances of this extension as you like!
Source code on GitHub