Hi! We received this question from a partner and figured it could be useful for more of you, so sharing it here :)

Step 1

Create a label via the API

https://api.cognitedata.com/api/v1/projects/{project}/labels

Document Reference

https://docs.cognite.com/api/v1/#operation/createLabelDefinitions

Step 2

Run the following transformation query with the created label

select

  id, externalId,

  array("<created_label>") as labels

  from _cdf.assets

where id not in (select distinct parentId from _cdf.assets where parentId is not null)

E.g

Create label as “leaf_node”

select

  id, externalId,

  array("leaf_node") as labels

  from _cdf.assets

where id not in (select distinct parentId from _cdf.assets where parentId is not null)