How to create pass-by-ref parameter with default value (something like “nullptr”) in Unreal's BlueprintCallable UFUNCTION?

Development Programming & Scripting C++
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Thanks, I think this actually might do the job in my specific case.
Just want to ask about one more thing related to this question:
Can I somehow specify the default value when using meta = AutoCreateRefTerm( "param" ) ?
The boolean pin with AutoCreateRefTerm will always show up ‘False’ state as the default one. And for example I want it to be ‘True’. I’m not able to find if this is possible. Documentation about meta specifiers doesn’t rly help Metadata Specifiers | Unreal Engine Documentation