Ability to add Guides to the Category axis of serial chart

[DaraghMcDonough]

If I'm charting values of say COVID19 cases (value axis) against dates/time (category axis) it would be informative to add in a guide on the category axis on a particular date to show when schools closed, or lockdown commenced etc to show the behaviour of the data after that date. 

[Arlington_CoGISMC]

Yes...I would like to show guides in the category axis to provide a visual of when Phase 1, Phase 2, Phase 3, etc periods are. This would be interesting to see along daily case data and provide a means to highlight possible correlations on opening too early (or not).

[KevinMayall]

duplicate idea - https://community.esri.com/ideas/18537