Dario, I'm inclined to be curious about that as well except that Vox Mundi (the official tourist service agency for the basilica) advertises an audio tour which states that it provides fast-track entry. See under "Do I have to queue up to enter the Basilica?":
https://www.voxmundi.eu/faq-frequently-asked-question/
This is the tour:
https://globol.com/en/rome-italy/exp/reserved-entrance-st-peters-basilica-audioguided-tour-1
Avoiding the queue is mentioned in a couple of the reviews. As well, RS poster Jay from Chicago (Hi Jay! Where have you been??!!)) bought this tour back in 2017 - only through a different vendor - as said while the audioguide didn't work, they did enjoy fast-track entry. He mentioned it in this thread:
https://community.ricksteves.com/travel-forum/italy/3-days-in-rome-should-i-goto-vatican-museum
Off top of my head, he's the only poster I recall having done it, though. Then again, my head can be sort of foggy.