Multiphonic chart fingerings

Hello,
I was wondering if anyone would be able and willing to help with my lissue: putting my piece for clarinets (made mainly out of multiphonic) into musescore and I haven't found a way how to put the multiphonic fingering picture in front of each multiphonic notated. I tried to import it as and image (PNG - which musescore says its supported, but the picture just doeasnt appear anywhere in the score). Is there anything I could do? Thanks very much :)