BigQuery labels - dbt_project file vs model config

The documentation here: BigQuery configurations | dbt Developer Hub

says that: The labels config can be provided in a model config, or in the dbt_project.yml file, as shown below.

Does it mean that they can’t be provided in both places? So far my tests confirmed it but I thought they would be additive since I’m using +labels in dbt_project.yml?

Can anybdy confirm if this is expected behaviour that the labels are overwritten by the model’s config?