I've been using the GMB Api but I still can't figure out how to format post through the Api or if its even possible. I tried sending raw HTML in the summary field but GMB renders it as a string. I searched the documentation but I can't find anything on how to properly format the post for example bold and italic sections. Any direction would be helpful.
Google My Business posts do not (currently) support any rich text formatting or markup. They are just plain text.