Add Custom Properties on Column

[weirongju]

Hi,

Thanks for this awesome solution.

I'd like to ask could we add custom properties on column?
I've checked the document:
https://docs.open-metadata.org/v1.3.x/main-concepts/metadata-standard/schemas/entity/data/table
and it shows "Cannot contain additional properties".
However, it's essential for our table design, since our dataset have lots of custom label and description and need to be maintained.
If it's not supported now, do we have alternatives methods or could we implement by ourselves?