'Amazon QuickSight - How to "Show relevant values only" with input parameter not in a control

I want to filter the content of a control to relevant values based on a filter applied to the dashboard. The filter is based on a parameter passed in via the JS SDK.

If I have a control (Control X) setting a parameter used by a filter then it appears a further control (Control Y) can have the displayed values pre filtered to those now applicable. This is done by enabling "Show relevant values only" on Control Y, checking Control X when prmoted and selecting the relevant field from the drop down.

However we have no intention on showing Control X to the user. What if anything can be done to get the intended behaviour?

Example Setup

Data:

|Type  |Item  |Price|
|------|------|-----|
|Fruit |Apple |0.50 |
|Fruit |Orange|0.60 |
|Fruit |Pear  |0.20 |
|Veg   |Potato|0.15 |
|Veg   |Onion |0.29 |
|Veg   |Carrot|0.08 |

Filter: On Field "Type", Filter Type "custom filter, equals" use parameters: YES, Parameter "TypeInput"

Controls: Filter: Item, Display name "Item equals", Style "Dropdown - muliselect", Values: "Filter" n.b. "Show relevant values" only greyed out ... will only appear when another control is added.

Intended Behaviour: When TypeInput is set to Fruit then Control Y should have Apple, Orange and Pear. When TypeInput is set to Veg then Control Y should have Potato, Onion and Carrot.

Actual Behaviour: Control Y shows Apple, Orange, Pear, Potato, Onion and Carrot regardless of TypeInput.

n.b If Control X added as text box the "Show relevant values" no longer greyed out in Control Y. When selected Control X is checkable and the filed "Type" can be selected from the drop down. Then when value is inputted (e.g. "Veg") into control X the values in Control Y are filtered as expected.