How do I add multiple rows to table in PostgreSQL?

I improved this a bit.

In the make array query, just return the array rather than set the temp var.

// jsMakeBulkBundleArray
  var newData = [];
  tblLineItems.selectedRow.data.forEach(row => {
    newData.push({
    line_item_id: row.line_item_id,
    bundled_sku: tblProducts.selectedRow.data[0].sku
  })
});
return newData

In your main query use the returned value to pass it to the bulk query:

// jsBulkBundle
  jsMakeBulkBundleArray.trigger({
    onSuccess:function(data) {
      qryBulkBundle.trigger({
        additionalScope: {
          dataArray: data
        }
      })
  }
});

And then use {{dataArray}} as the Array of records to update in your SQL query.

25% fewer moving parts to keep track of.