Parameters for dynamic_select elements

[pennings-tamu]

Investigate possibility to add form parameters to a dynamic select call. E.g. in schema.json

"mydropdown" : {
"type" : "select",
"name" : "myselect"
"options": [
{
"value": "option",
"label": "Option 1"
},
{
"value": "option2",
"label": "Option 2"
}
]
},

"mydynamic" : {
"type" : "dynamic_select",
"retriever" : "retriever_func($myselect)"
}

In the code snippet, the dynamic retriever function will pass in the value of "myselect" to retriever_func.

Investigate if this is feasible in the current implementation,