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. series.1.data 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 series.1.data.y to the count from series.0.data.y? 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!

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