@Sweatpants, This would need some custom code, could set up a test page for me to try some ideas?
I imagine the text would be from within the categories collection list so please add a text block with this text to your filter element and give everything appropriate classes as this could also be done via CSS 
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Thanks @Support-Luis! I’ve sent you a DM with a link to the project, as I can’t share it here for the public. 