We can see shias from the past till our times relying on commentary of Ali ibn Ibrahim al-Qummi. Each book in Islamic nation has its own chain of transmitters. Including this commentary of Ali ibn Ibrahim.

Let us check page 27 of on-line version of this tafsir, to see who is the very first person who is in the chain of narration.

http://www.al-shia.org/html/ara/books/lib-quran/tafsir-qommi-j1/01.html

As you can see first person in the chain of transmitters is – Abul Fadl al-Abbas ibn Muhammad ibn al-Qasim ibn Hamzah ibn Mosa ibn Jafar.

This person wasn’t mention by shia scholars of rijal, as said ash-Shahrudi in “Mustadrakat ilmul rijal al-hadith” (4/357/#746)