Using \markup to define arrow-heads with TextSpanner

[NMcB]

Hello everyone,

First time poster, and recent Lilypond convert. 

I was wondering if anyone could advise what the process to modifying
arrow-heads in the TextSpanner is?

I've got as far as '\override TextSpanner.bound-details.right.arrow = ##t',
which is all good and well, but I can't seem to find a means to replace that
arrow-head with a \markup{} closure. 

Any advice for this would be very gratefully received!  

Thanks, and best,
N




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