How can I programmatically add or remove a new request_path to block visibility?

It seems like I could utilize the getVisibilityConditions method on the block, which returns a ConditionPluginCollection object with a setInstanceConfiguration method, which is apparently easy enough to use, requiring $request_path and $configuration arguments. But, the current block visibility request path variable is a string, containing paths separated by commas. How can I update that to either add or remove paths on node save? I know that I’m essentially asking how to manipulate block visibility on the node form, which isn’t completely wrong. It just seems like I could be missing something in the API that would allow this kind if thing.

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How can I programmatically add or remove a new request_path to block visibility?

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