With the current implementation of the Native Grid, if one needs to set a minimum width to a column that needs to add the implementation suggested in this Setting a Minimum Column Width example.
While the approach in the above example works as expected, the logic that needs to be added can be internal for the Grid component. Thus the users will have to add a simple column property like the below and no other configuration should be set.
{
field: "ProductName",
title: "Name",
minWidth: 200
}