=CELLPROPERTYWRITE(
SETPROPERTY(
SETPROPERTY(
CELLPROPERTYGET("noteReporting","data_connection","cube", dim1, dim2,..),
"FormattedNote","content",GETPROPERTY(actions.input.text,"FormattedNote","content")
),
"PlainNote","content",GETPROPERTY(actions.input.text,"PlainNote","content")
),
"NoteReporting","data_connection", "cube", dim1, dim2,...)