Add or change the description of a custom attribute in Autodesk Construction Cloud using Forge API

I want to change/add the description to my newly created custom attribute in Autodesk Construction Cloud via API.
I know how to add a new CA but in the POST body, but there is no field foreseen (in the body of the request for the description) of the attribute, nor is there a ‘description’ field in the response JSON when I query for an existing attribute.

Is it therefore possible to change the description of an attribute via the API and not via the UI ?
If it’s possible, which API should I use ?

TIA,
Mark