Using Radio Buttons in Bamboo Plugin Task

I am working on adding a simple Task in Bamboo. In this task, I would like to have a radio selection option over a drop-down selection and I have seen it used in other tasks, but I can’t find in the documentation, how it should be configured or an open sourced task using it as an example.

Can someone please give a simple example of how to setup the radio option in the Freemarker file in Bamboo for the task, and how to check for the option in the task java class.

Thanks!