I'm curious if there's a way to export animations from Adobe After Effects to SVG containing SMIL
I'm currently using the tool Bodymovin, but that's limited to only exporting bloated JSON files and is depended on external scripts.
It is not likely that this tool exists, i wont say "no", but unlikely. If it would, then the community would be aware of it or that it would be very proprietary which wouldn't help you much anyway. SMIL already on its way out of circulation (chrome is dropping support) so its very unlikely that somebody still has anything like this in works.
But that's limited to only exporting bloated JSON files and is depended on external scripts
* Its not really hard but rather time consuming