I posted what I think was a similar issue/question earlier this week. I'm super swamped at work right now so I haven't been able to fix/work on it. But I believe what
@carlw mentioned about having a popup is the way to go. I had something in the past like that and I'm hoping I can get a sample up and running soon.
I tried digging up old SO answers and I think something like this is what I've done...
https://stackoverflow.com/questions/26854301/how-to-control-the-javafx-tooltips-delay
Open to other suggestions... Good luck!