How to create matrix visualization

Grafana 10.1
I am trying to create a matrix to see network links.
I have prometheus data returned such as:
OctetCount {src=“A”, dst=“B”} 3
OctetCount {src=“B”, dst=“A”} 3
OctetCount {src=“B”, dst=“C”} 5
OctetCount {src=“C”, dst=“B”} 7
etc…
I would like a table such as:
A B C
A 3
B 3 5
C 7

I have found the Transforms “Label to fields” and “Grouping to matrix” but I have not figured out what visualization can present this data.
This seems like a simple task, so I think I am missing something obvious or it is not possible.
Can anyone give me some pointers?