Currently there is none, the widget is just a table with its own header. We cannot add a header row as in the case of standard multi-value fields because multi-row table header is not supported in core and even if it was, it wouldn't look good probably.
Add a container theme wrapper to the element with a h4 title.
Make it look better somehow.
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It's likely this issue predates Contrib.social: some issue and comment data are missing.