Add library blocks directly in models

Hi, great CMS, but I’m surprised I can’t add blocks from my library directly into a model.

I understand I can add them using Modular content, but I don’t want editors to have to add a new item.

I want to add a few extra SEO fields such as canonical url, no-robots fields, etc. inside different models, but was hoping to have a centralized block if I ever needed to make edits to these fields, without having to go inside different models.

Could this possibly be a feature in the future? Add block types into models as a field group?