Set M Query parameter Select All slicer option to return list of selections, not "__SelectAll__"

I have a dynamic M query parameter which holds a list of IDs that are then passed to a query (specifically, a Kusto function that will return the desired table rows). Everything works perfectly with multi-select, but I want to allow users to "Select all" since there are a lot of IDs, and it's often not reasonable to select them individually.

Altering my function to handle the "__SelectAll__" value and return data for all identifiers in the table works. However, I have additional slicers in my report that filter the available values for the ID slicer; if users "Select all," the value of the parameter just becomes "__SelectAll__" instead of a list of IDs, so the query will return results for all IDs instead of only the IDs selected in the slicer.

So, my question is: How can I make "Select All" act like multi-select for a dynamic M query parameter, sending a list of all of the selected values instead of the string "__SelectAll__"?

To be clear, this is what I'm referring to:

I want the "Select all value" to just be a list of all the selected values, since the values available in the slicer change based on other user selections.