I don't know about experts, but we've seen Trump say that there's a lot of evidence it came from the lab. That's about all you need to know. Also the facts make it painfully obvious. They literally pieced it together using other viruses and was exactly what this lab was funded to experiment with.

The moment I lost any doubt was I read that "leaked" five eyes report in the Australian press that criticized Chinas response... but that just happen to slip in a line announcing that they put the odds of it coming from the lab at only 5%. If you don't instantly know exactly who is responsible for COVID and where it was released after that last sentence I suggest you look into Spygate a little more, particularly focus on the deep states use of selective leaks and the role of the 5 eyes intelligence network.