Z Visa related

Hello. Found you on internet, thought you have the answers to my question.
So I was working in China, came back early this year for holiday but has been stuck ever since due to the pandemic.
I am Indonesian by the way, and four days ago China opened the border for Indonesians with valid residence permit.
Unfortunately mine was expired on the 14th this month, so I am not eligible, however, I can apply for Z visa to enter, which requires an invitation letter for work visa.
Since I was already working, and got my work permit already, that means I already was given the letter once last time (specifically on August 2019, I got the letter, applied for Z visa and entered China with it then changed it into a residence permit)
My question is, is it possible to get another one again under the same company with the same work permit? Because my work permit is still valid until next year. Or do I have to go through the process all over again? From 0?
Please provide me with any useful information you have.

Hope to hear from you soon.

Regards,

Endry