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I do not believe it is possible to add a sub-heading for each radio option. If you are trying to have an extra set of options for your radio buttons, you could always show another set of options based on the selection made. Here is a test form to show what I mean:
Though depending on what you are looking to do, this may not get anywhere close to what you need.
If you could let us know a bit more about what type of extra information you are trying to add about the radio buttons, we may be able to find a workaround for you. Though adding more text below the radio button heading I do not believe is possible.