Hi @marcw ,
welcome to the Kibana community.
It is not trivial do have multiple series in Canvas charts, and it requires to change slightly the data: Canvas: how to make stacked area chart? - #2 by Catherine_Liu
Another solution would be to create the visualization with the Lens or Aggregation-based editor, save it in the Visualize Library, then import it in Canvas: Canvas | Kibana Guide [master] | Elastic
Note: in case of import from other Kibana editor mind that the time range is saved within the visualization and not in the Canvas workpad