I have a solution for you two years later
In the logical editor, the following will get you a note within a chord which is close to what you’re after:
//////Line 1
(
Position
Inside Bar Range
0
[max]
{select the entire bar range}
AND
//////Line 2
Context Variable
Bigger or Equal
Note Number in Chord
2 //This selects the third note within a chord
)
A more complex arrangement can be structured based on the number of notes within a chord that select based on OR operators.