Astro66

Hello, I just bought a megamo bike with DJI avinox M1. I want to upgrade my derailleur to Shimano, simply because I don't like SRAM.
Can you please help me in some doubts I have...

What is the voltage output on DJI expansion port?
Can I connect di2 etube connection directly to expansion port?
Does the smooth shift work with Shimano di2 derailleurs?

Thank you in advance,
Carlos