How can I set proto hierarchy & response times in a lua dissector?

Hello there,

I am writing a lua dissector for a custom protocol.

To make it more intuitive, I would like to add information to "Statistics->Protocol Hierarchy" and "Statistics->Service Response Time".

Can somebody tell me, what datastructures Wireshark uses to generate these statistics and how/whether I can set them via a lua dissector?

Cheers, Niklas