Canonical is already supported by Webflow through custom attributes, ad a rel=canonical to any page, or use custom code on
<head> to add it to certain CMS content. However that would be cool to have this option at page level, maybe.
og:url, og:type, fb:app_id are really for Facebook business. The first one prevents fb to scrape further away, type is for how the Like button will be handled and to last one is self explanatory.
What in your use cases absolutely requires that you have the url and type attributes? (genuine question )
Opinion — that is personal, obviously: The OG tech is really useful and the fb scrapper very effective, but do we have to craft our sites for Facebook? We’re already bullied by Chrome into having all of our site SSL for no valid reason, let’s not feel obliged to follow Facebook rules and clutter our tools.