As indicated in this thread:
https://www.msofficeforums.com/word/...-wingding.html, where you have already posted, you can do that using Find/Replace. The only checkboxes you can use for the replacement on a Mac is formfield checkboxes; even after pasting, these won't work unless you apply 'filling in forms' protection to the document.
PS: please don't raise what is essentially the same issue in multiple threads.