Group ListView Command Set extension buttons under dropdown?

[Andrew McHargue]

Following the walkthrough at 

https://docs.microsoft.com/en-us/sharepoint/dev/spfx/extensions/get-started/building-simple-cmdset-w...

how can I group "Command 1" and "Command 2" under a parent button that functions as dropdown to show these two options?

This is similar but targets a different location: 

https://docs.microsoft.com/en-us/sharepoint/dev/solution-guidance/modern-experience-customizations-c...

If there's a way to adapt this to ClientSideExtension.ListViewCommandSet.CommandBar , I am not seeing it.

Thanks for any insight.

[#2]

Fwiw I see this on user voice, but I am wondering if the user who posted this and I are missing something that can be done in the elements.xml or something else.

https://sharepoint.uservoice.com/forums/329220-sharepoint-dev-platform/suggestions/31785541-support-...