Available in LabVIEW 2016 and later. Right-click the border of an In Place Element Structure and select "Add Variant Attribute Get / Replace".
Since LabVIEW lacks a native dictionary/hashtable/associate array implementation, I find myself using Variant attributes for this. A lot. And they work beautifully. But I'd really love to be able to use the IPE structure to be able to operate on my name/values:
There are definite cases when the value can be operated on in place, and it cleans up the code considerably by not having to keep the variant and key wires along for the ride when you're done operating on the value.