ColumnSet data binding?

[RD8388]

"body": [
{
"type": "Container",
"items": [
{
"type": "ColumnSet",
"$data": "${favlinks}",
"columns": [
{ ...

The above "$data" property works in the https://adaptivecards.io/designer/ but displays an error in Visual Studio Code.

How should I bind the ColumnSet to a collection in my .data.json file please?