Greetings from Syncfusion Support.
Query: “I didn't see this specifically in the documentation, are detail grids bound to master grids supported? ”
Your requirement can be achieved using Detail Template feature for EjsGrid. Refer our UG documentation to render a Custom component (another Grid) inside Detail Template to get Master Detail behavior.
Please get back to us if you have further queries.
Regards, Vignesh Natarajan