"Let’s look at the big picture: A novel SARS coronavirus emerges in Wuhan with a novel cleavage site in it. We now have evidence that, in early 2018, they had pitched inserting novel cleavage sites into novel SARS-related viruses in their lab,” said Chan. “This definitely tips the scales for me. And I think it should do that for many other scientists too.”
Richard Ebright, a molecular biologist at Rutgers University who has espoused the possibility that SARS-CoV-2 may have originated in a lab, agreed. “The relevance of this is that SARS Cov-2, the pandemic virus, is the only virus in its entire genus of SARS-related coronaviruses that contains a fully functional cleavage site at the S1, S2 junction,” said Ebright, referring to the place where two subunits of the spike protein meet. “And here is a proposal from the beginning of 2018, proposing explicitly to engineer that sequence at that position in chimeric lab-generated coronaviruses."
And then what's more, they sat on the fact that they had requested funding for this research for the last 18 months, when the world has been desperately trying to find any relevant information on the virus' origins. The fact that they did not put this forward themselves in in and of itself suspect.
"Leaked DARPA proposals adds weight to lab-engineered sars-cov-2 hypothesis"
...or something along those lines. The problem is that "points to" is a pretty strong direct relationship. But these docs aren't directly related apparently (since the research was rejected by DARPA). It just shows that labs were potentially interested in creating such viruses. But that does hint that such a scenario could have been possible.