After some research I am a little surprised Metabox doesn't appear to have an easier way to insert custom field data into Gutenberg Post content.
I have options page setup with company info like name, email, phone number, etc... (some of this info is in groups as there is more than 1 email address etc) and it would be really nice if I could use some syntax like {site_name} within paragraphs, headings, list items, etc.. and the data from the custom field would replace it.
MB Views is more for a block of content so it will not work in this situation.
I had thought of using short codes but Gutenberg doesn't let you place short codes within copy. It has to be a separate block.
I can't be the only one wondering this. There is a post about it on the Trello roadmap which says it is currently being worked on but the roadmap doesn't appear to be updated since 2022.