How to define “Attribute Groups” on sample data?

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I would like to use defined groups within Attribute Groups plugin “Attribute Groups” instead of sets of them like this sample
<product>
<title>Wagyu Tenderloin Steak</title>
<price>55</price>
<weight>6 oz</weight>
……..
<qty />
<description />
</product>

How can I do this?

something like this

<product>
<title>Wagyu Tenderloin Steak</title>
<attgroups>Defined Attribute Group NAME</attgroups>
<qty />
<description />
</product>