Unfortunately not yet. We do have this on our long term backlog but no short-term plants to update that card.
Is there anything else you'd like to see about the summary statistic card? Does not having a source link toggle block you from using the card?
Is there a guide for the Summary Statistic Card? I'm having trouble with it when trying to filter by an attribute. All I've been able to find is this Design the layout of your Hub site—ArcGIS Hub | ArcGIS .