According to the Knowledge base Zoho Sites should have a schema builder: https://help.zoho.com/portal/en/kb/zohosites/help-guide/configuration/seo/articles/zoho-sites-schema-generator#To_add_structured_data_using_Schema_generator

However this is no where to be found in the zoho sites menus...is this no longer supported?  Or is it functionality that hasn't been updated?