Use EXP pedal to control FX options

What is the problem?

I can’t use a expression pedal to control the main fx options in the effects knob list.

What should this feature achieve?

We should be allowed to assign expression pedal to control the fx options in the effects knob list. Right now it seems we only have a few options in the set up menu that we can use with expression pedal. However some of us use STEP on desktops and what not and I’d love to be able to use expression pedal to control the fx per patterns. So give us a setup menu option that allows us to use expression pedal to control FX from effects knob list.

Or an option to use a footswitch like boss fs-5u instead of expression controller which may make more sense for this?

Are there any workarounds?

Only using the effects switch on STEP.

Any links to related discussions?

Any references to other products?