dot html edges labels coord

How to get coords from labels for html

Hello, it is my first project with graphviz and I hope you can help me.
I have a matrix in excell with a nxn relatonship and wants to display as an
digraph. At the edges I want to have some labels and I want to display it in
the IE (so svg is not working).
So I collect all datas from the excell sheet and create the input file for dot. The outputfile is a png and a an imap file. I thought I can get the coords for the labels from the imap file, but tis was not totally correct.

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