Power zone trend custom chart

Hi - would like to build a Power Zone distribution trend chart, with Power/HR plots. In fact exactly like the example chart shown in About | Intervals.icu (Build Your Own Charts - Custom Chart 5).

Can you advise how as I have tried it in the Compare - Add Chart - Custom, but still can’t get it.
Thanks

You can’t create a chart like that on the /compare page yet. You can do it on the /fitness page and “time in zones” is one of the presets you can add from Options → Add Chart and then customise.