Yes, I watched a video[0] about using CHECKs and pg_jsonschema to do this in the past. However this only checks for conformance at insert/update time. As time goes on you'll inevitably need to evolve your structures but you won't be able to have any assurances to whether past data conforms to the new structure.

The way this article suggests using JSONB would also be problematic because you're stuffing potentially varying structures into one column. You could technically create one massive jsonschema that uses oneOf to validate that the event conforms to one of your structures, but I think it would be horrible for performance.

[0]: https://www.youtube.com/watch?v=F6X60ln2VNc