Funnily enough, I’ve thought about doing this recently with Sanity. My thinking is that I would have Sanity sync over bare-bones content to webflow CMS (convert the json markup to webflow’s rich text) for SEO – then on the front end load in the richer content from sanity over the top of the CMS content.
You can sync your content by setting up a webhook on sanity (I imagine you can also do this on hygraph) and routing it through either make.com, zapier – or edge function.