No milkable tag

Probably a feature request.
Within

/data/minecraft/tags/entity_types/

there is no tag for controlling which entities produce milk when right clicked with a bucket.

Other tags in this folder control:

1. Which entities cause a creeper to drop music discs

2. Which entities glow when ringing a bell

3. Which entities walk on powder snow
   To name a few.

In 21w13a a third, non-cow, entity has been added. It is plausible that the omission of this tag could be a missing feature.