Guitar harmonics indicators

[Andrew Bernard]

Not being a guitar player, I am out of my area here, hence my question. 
Referring to the attached sample image, my composer uses a circled numeral to 
indicate the string number, with superscript roman numerals to indicate the 
fret on that string to play for a harmonic. Is this standard for fretted 
instruments? Has anybody got a function written already that does this? I was 
unable to find anything the same as this in the NR or LSR.

Andrew

harmonics.jpg
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