Hashing information being sent to Meta Pixel

Meta has blocked my event paramters, due to the phone parameter including phone numbers was being sent back to the meta pixel.

This data is somehow being sent back from the form, but I can’t understand how, because adding the facebook pixel on Wix is done via a custom code.

Meta is now asking us to hash the phone number and then send it back to the Meta Pixel, we can’t understand how to do this since there is no snippet of code to edit as such.

It would be great if someone could guide me on how I can do this!