Feature Request: Variables in content defaults

[rickmills]

For our blog we've built a 'fallback' tool for automatically generated twitter/og images. I spotted that AardvarkSEO supports setting content defaults, and what I'd love to be able to do here is specify those images as something like /image-generator/{slug} but I'm guessing that's not possible right now.

I appreciate this is likely low on the priority list as it's a pretty niche thing, but it did also get me thinking that it would make sense for the meta tags as well if you could essentially parse antlers there for things like prefilling the meta description with a truncated copy of an intro or body field.