reference line using table calculation total

[Daniel_Pires]

hi there, I’m trying to create a bar chart with a reference line. each bar is the result of a table calculation field called AOV (this part is ok). for the reference line I wanted to use the total value of the AOV field. Its not a simple average, or median so I tried to use the custom value, but with no luck.

it there a way to use a variable in the custom value?

thanks in advance