Question: How to place tooltip on node?

I have a tree where the node title shows up as red when there has been an error validating the node. I would like to put a tooltip on it showing the error message, but I don't know how to add this. I'm adding the necessary styling for errored nodes in the generateNodeProps property, which also provides the buttons for the nodes. Is there something else I could add to this property to get the tooltip to show up?