Currently for service calls, “Instead of targeting an entity, you can also target an area or device. Or a combination of these. This is done with the target key.”
It would be good if Groups were added as targetable
Why do you think you can’t now? A group has an entity_id same as anything else, and targets can use entity_ids according to the page you linked to.
Good point!
I’ll give it a try later
Yes that works. 
Ignore this request.
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