Show how processor groups connect High Level Diagram

[06nenglish]

Is your feature request related to a problem? Please describe.
When doing a Zero depth search Dotifi returns the name of the canvas and that's it,which I'm not sure is by design or a bug? If I do a depth of one, it then starts to show me the content of the processor groups.

Describe the solution you'd like
Dotifi generating a diagram of of how the process groups are connected by the internal input and output ports

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
Screenshot of Flow and Desired output

Example Flow NiFi Template
Example_Flow.zip

Graphviz files
dotifi_output.zip