I've not been able to find that if we've technology to edit RNA.

I see that DNA changes are possible through CRISPR.

But it seems changing RNA could be possible if you've extracted similar virus from some animal then you replicated virus in a culture, after that you wait for the virus to mutate on its own or create condition to increase mutation rate for example radiation etc...

So the biological footprint being similar to the one which exists in nature doesn't really remove the possibility that the virus might be man made.