XY Chart: add 1:1 line

I have this XY Chart panel

I’d like to add a 1:1 line to it:

I couldn’t find a way to do it, it doesn’t seem to be possible “natively” but I also couldn’t find a way to hack it, e.g. add a second series with 2 points (0,0) and (max_value, max_value).

Thoughts?

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