If you'd like a more updated version of my explanation (or moreover anyone who finds this comment in the future). I did another similar explanation recently on the lemmasoft forums that has a bit more code and is probably more versatile. Can check it out here if you want. https://lemmasoft.renai.us/forums/viewtopic.php?p=541961#p541961
The method is different because I think filter_text_tags might throw an error now due to the what not display what it is supplied or something. But I know this other method should work if my previous solution isn't working out.