Tables are partly supported and can arrive in OE via cut and paste and via upgrade. Tables are needed when you present tabular data so should be added for that.

So technically this story is about first and foremost just exposing the builtin table support in Alloy, and adapt our embed logic to make sure it can not be added to table as it breaks down (future editor milestone work will be needed on that)

Disclaimer: eZ does not think tables are good for layout, plenty of users tend to use it for that to, so future feature is to be expected on that, which may or may not align with layout concepts in landing pages and other layout solutions.