Entries
Support Count
if(empty(prop("Supports")), 0, length(replaceAll(prop("Supports"), "[^,]", "")) + 1)
Explanation
if(empty(prop("Supports")), 0,If Supports is empty, display 0.
length(replaceAll(prop("Supports"), "[^,]", "")) + 1)Otherwise return just the commas from the comma-separated output, then count those commas and add
1 (to compensate for the last entry not having a comma after it). 
