VST3 Client Extensions (Prefetchable support)

Hi,

I would like to set my own value to VST3 prefetable support.
Prefetchable documentation

I see that it could be possible with overriding the AudioProcessor’s getVST3ClientExtensions function. Is this the correct way?

Based on the documentation (JUCE: VST3ClientExtensions Struct Reference) I don’t know how to use VST3ClientExtensions class in this case.
Do you have any experience using this and do you know if there are any example code or projects available? I tried to search but didn’t find any.

Thanks, Veikko