How to use built in/custom functions

How to use built in/custom functions

Since ADManager Plus comes with Built In Functions (Find Replace, Encode/Decode URIs, and Regexs) and Custom Function where we can run a script. This is good feature.
https://www.manageengine.com/products/ad-manager/help/admin-settings/how-to-create-and-manage-custom-functions.html#:~:text=Create%20and%20manage%20custom%20functions

I'm trying to find any docs to see how to apply this in my automation. Is there any example?

                  New to ADSelfService Plus?