Is it possible to annotate each result in a result set?

I have two types stored in an index: locations and activities. An activity
has a 'relation' to a location - ie. an activity takes place at a location.

Is it possible to get a location search result set that includes the count
of activities at each location? Sort of like annotating each item in the
location results?

(This is my second attempt to post - apologies if this is a duplicate post!)

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