I've had family members charge their Teslas from my Rivian Charger dozens of times without issue. They all have their own J1772 to Tesla adapters that were supplied with the vehicles.
I really hope Tesla does this. Being in NJ the EV charging infrastructure is decent, however adding in Tesla would make travel much easier. The east coast in general is not getting much attention from Rivian. There is not a single Rivian charger in NJ. NOT A SINGLE ONE and NOTHING COMING...
NJ here and my tag is on the passenger side, works 100% of the time on the Garden State Parkway and fails 50-60% of the time on the NJ Turnpike so go figure!