Kanban view grouped by lookup field or link field

It would be very usefull to have an option to group Kanban stacks by a lookup field from another table or a link field, when the multi-select option for linking to the table is turned off.

I believe this should satisfy the requirement that each item on the Kanban can appear in only one stack, but also allow stacks based on lookups or links from other tables.

Example : Table Employees linked to a Table Companies
It would be very convenient to get a Kanban view or the Employees stacked by Company