Add class to gfield_radio wrapper/div

I’m trying to add a class to the the .gfield_radio wrapping div. I already have the gform_field_choice_markup_pre_render filter set up to add classes to the inner inputs and labels, but I didn’t see a filter that would allow me to modify the container. The highlighted line is the div I want to add a class to:

I know I can add it via js/jQuery, but I’d prefer PHP, if something is available.

Thanks in advance!

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