width of the grouping row in Timeline

[Hirn]

Hello dear developers,

I was faced with the following phenomenon in the Timeline.
The width of the grouping row is limited by the width of the Lane column .
Is it possible to do the same as done in ListGrid, where the width of the grouping row is equal to the width of the entire ListGrid component?

[Isomorphic]

This isn't possible because Timeline groupFields are frozen, in a different body from the other fields - ListGrid group-rows will size to fill the body containing the group-field, but can't span both bodies.