To expand this API method:
https://we.phorge.it/conduit/method/project.column.search/
It would be nice to implement something like this patch implemented by Wikimedia folks:
https://phabricator.wikimedia.org/rPHABebfe30890b52784d222ec4ed36c05462b2a57f92
Note that - at the moment - these are the only elements returned:
| name | string | The display name of the column. |
| project | map<string, wild> | The project the column belongs to. |
| proxyPHID | phid? | For columns that proxy another object (like a subproject or milestone), the PHID of the object they proxy. |
| dateCreated | int | Epoch timestamp when the object was created. |
| dateModified | int | Epoch timestamp when the object was last updated. |
| policy | map<string, wild> | Map of capabilities to current policies. |