v-data-table extend groupBy functionality

[paulwer]

Hey everyone,
i was wondering, if there is a possibility to even extend the groupBy functionality. Maybe our usecase is already possible :)
We want to group rows only if there are at least 2 Entries and want to combine rows into the groupBy heading.
I thought about making this work by a custom groupBy slot etc. where we can defined, what to display in each cell and if necessary hide the button for opening the grouped data (i.e. when only one row is defined)

Hoping for good feedback / input :)