First of all thank you for a great software and all the help from this forum. Until now, I've not had to post due to the quality of solutions. Now, I'm stuck. I'm wanting to add the notation key in the title amongst others.
Using the format string "%title% BPM:%bpm%" that worked fine
I referred to the (screen)dump. That picture only shows the list of the elements in the tag panel but not the details for the element for key - which would have been the label plus the referenced field.