[O] How to execute sudo command in Docker container with Org ob-shell through Emacs package docker-tramp?

[stardiviner]

I execute the following src block example, but it does not work as I
expected.

#+begin_src sh :dir /docker:ubuntu:/root|sudo::
sudo echo "hello, world" > kk
cat kk
#+end_src

I think the TRAMP multiple hops need hostname in sudo:<hostname>:, but I don't 
know how to specify Docker hostname in this place.

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