These questions:

How to edit a custom property in a python script?

Copy Custom Properties from one object to another

mentioned the usage of _RNA_UI. But I googled for a while and found no document about this mysterious property. What's _RNA_UI exactly? And the fact it's undocumented and starts with _ makes me wonder if it's a private API and not supposed to be used by scripts?

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    $\begingroup$ No issue with using it. When you add a custom property via UI extra added info like "min", "max", "description" is stored there. These are used by UI when rendering the prop.in layout. Related blender.stackexchange.com/a/123687/15543 $\endgroup$
    – batFINGER
    Jul 9 at 19:09

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