Hi Austin,
You can use the bootstrap tool tip widget to do this with radio buttons
https://appstore.home.mendix.com/link/app/1939/Mendix/Bootstrap-Tooltip
Just add a class to your radio buttons and set the target class in the widget to the same.
This will add help text over all the radio buttons. i'm not sure if you are trying to get help texts over each value, which would be a bit more difficult.