Hi!
I don’t know of any way Umbraco 13 provides this functionality.
How I would go about this is to create a composition containing a “hideInFrontend” true/false toggle. Then I would apply this composition on all of the items in the blocklist and add a check in the frontend whether to show/hide it.
With the extensibility of Umbraco 14+ I would reckon that it must be somehow possible on those versions 
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