@Guillaume CASTAIGNAU
I don't think this is feasible and you cannot do this from the Cost Management portion of the portal. The only possible way to do this is to create a diagnostic setting for Azure Monitor to log every transaction and then do analysis on those logs to see how many of each transaction is coming from the service accounts as well as how much data is being transferred in each of those transactions.
Hope this helps. Let me know if you have anymore questions and I will do my best to answer?
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