How to call setProp from within a onNodesChange

[nathan-karo]

I have a function attached to <Editor onNodesChange={...}>.

From within this, I am able to use the query to parse the Nodes I am interested in and calculate an application specific value based on the nodes siblings.

What I want to do from there is store this value against the Node, so it can be retrieved later in the rules. I can't seem to set the props or custom object directly as I get an error about them being read-only.

Is it possible to somehow access the setProp or similar to set either props or custom to stash my data?