Using Count controller with fractional step size set from variable

I am new to flutter flow and am trying to re develop an existing app using Flutterflow and existing backend APIs without major changes to UX.

I am trying to use count controller widget to let users set up quantity for items in the order. I notice that it neither allows fractional step size (.nn) nor the step size is available to be set from a variable.

I wonder how people use this to build ordering where each item can have a different step size and may be fractional like (0,25 Kgs)

Am I missing something? I am sure this is needed in any commerce app.

Please let me know.

Thanks

Spart