Field name for a collection to be populated from another collection

Hi guys,

New here. I have managed to get by with videos and community discussion but I feel I need some quick help here.

I am making a vacation rental app where the hosts can upload properties. Now, I have added city / town as a field that must be added by the host. This populates on the properties collection under field name (propertyCity).

I have a collection called places that should be an extension of these cities / towns that will be filled in by the hosts. I want the name of each place to be populated dynamically from propertyCity under the properties collection.

I was hoping for this to be set up in the schema side.