Short answer: No, and it's not happening.
The Chargers have explicitly stated they are not considering a Justin Herbert trade — even though they're 0-5 and considered deadline sellers (from the Tuli Tuipulotu page, referencing an Oct 15 report titled "Chargers Not Considering Justin Herbert Trade"). They're open to moving veterans like Khalil Mack and Tuli Tuipulotu, but Herbert is viewed as their franchise cornerstone. Jim Harbaugh and Herbert are a "proven pairing," and the team just hired Mike McDaniel to unlock Herbert's potential.
Meanwhile, the Vikings are 5-0 and have already committed to Kyler Murray as their long-term QB after trading J.J. McCarthy to the Giants. They're positioned as buyers at the deadline, but for tight end depth — not a $50M+ franchise QB.
So even if it's fun to dream about Herbert throwing to Justin Jefferson, neither side has any interest in making that happen.