Dynamic Dropdowns on new Dashboard Studio

[n00b]

I am trying to create a dashboard with Dynamic Dropdowns using the new JSON of Dashboard Studio. I'm not great at the XML of the Classic Dashboards, but there are a good bit of videos/sites that help show how to do things and why. Dashboard Studio appears new enough that it doesn't have much for a rookie like me.

I'd like something like https://www.youtube.com/watch?v=BJm04grvvf8 but for Dashboard Studio. Anyone know of anything? I am coming up with nothing. I just have some documentation that I'm not great at reading and understanding at https://docs.splunk.com/Documentation/SplunkCloud/latest/DashStudio/inputs found from https://community.splunk.com/t5/Dashboards-Visualizations/Dashboard-Studio-Dynamic-loading-a-dropdow....