putting music functions in markup

[Ryan Michael]

I would like to add  the engraving of  

<c g'\harmonic> in an editorial note

within the markup below an actual note event. 

It simply needs to show the interval of a fifth and that the top

note has the harmonic note head. 

How can I do that? 

The following throws an error saying you can't add music functions in the \markup{}

tag

-\markup{\italic "sempre" <c g'\harmonic>}

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ॐ नमः शिवाय