Aggregation of fields

How do I aggregate fields with vega in a sankey graph? I want to build a graph that shows AS paths using bytes. I have most of the graph in place.

However, when I use bytes I get a 'flow' for each different number, can I aggregate these? So instead of having 3 'flows' showing 15, 20 and 54 bytes, have 1 'flow' showing 89 bytes.

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