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Hello S.,
With version V1.2020.16, you can now have:
@startgantt Project starts the 30 march 2020 [plan1] lasts 25 days [1st_r] happens at 2020/04/01 [2nd_r] happens at 2020/04/03 [3nd_r] happens at 2020/04/06 [1st_r] displays on same row as [2nd_r] [2nd_r] displays on same row as [3nd_r] @endgantt
[See on PlantUML server]
See also:
If that can help,Regards,Th.