Hello Xiangyu Luo @ Tursio.ai
For the non-Microsoft extensions it is a white glove approach to onboarding new publishers. I have looped you in an email with product management team and they will take it from there.
For all the customers with similar request, please post a question on the Q&A just like this one or reach out over a support question and we will reach out privately over an email as the process to onboard an extension needs discussions with the VM product management team.
If I have answered your question, please accept this as answer as a token of appreciation.