Can't change column value(s)

[TMNXT-Dev (Ilja Zweigert)]

const query = 

`mutation change_column($value: JSON!) {

     change_column_value(board_id: 726291451, item_id: 726291453, column_id: "status", value: $value) {
          id
     }

}`;

const value = { "value": "{\"index\": 1}"};

And this should work also, if I’m not mistaken.