Static vertical line in xy chart

I have an XY chart set up as a histogram and want to add vertical lines to indicate target/min/max. I've found a couple posts with some solutions but they aren't working for me.

I have a second data source with the target/min/max data and confirmed that it's working correctly. is set to the 2nd data source but I don't have a y reference since it's a single row of data.
Can I bind the to the count from How would I do that?

edit: another thought: Would I be better off doing a JOIN on the named query and adding the target/min/max to the first dataset?

Duplicate post:

Please don't do that. Edit your first post to improve it!