[Lizard]

For some situations, the 'address or search' way of setting a location may do what you want.

You could set a search for "grocery" and it will ask Google maps where the nearest grocery store is. Or you could give it the names of your preferred grocery chains (eg "Whole Foods" OR QFC).

Does this help? If not, could you provide an example of when you want to assign multiple locations to a context?