The feature i'd like to have should work like this:
You have multiple context stores (like here: link to doc describing the setup of multiple context stores
Then, to "convert" some properties from one store to another (e.g from memory store to file store), there is a button near every property (in the context view of the sidebar) that lets you select the store to put that property into.
when you select a store, each node containing that property is changed to use the "new" store and the property is moved.
I'd like to have that feature because in a project which has 3 flows, ~400 nodes and ~20 "mentionings" of a property you want to move, it can be frustrating to search each and every node if it is already changed...