I can’t be the only one needing this desperately
You are not the only one… and it’s going to be in the next release of dash-core-components! 
See https://github.com/plotly/dash-core-components/pull/948
Thanks to @tcbegley for doing the pull request. This will be a great addition to the dcc library.
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That is so awesome and many thanks to @tcbegley for the update. When can this update be expected?