Welcome to the forum.
My observation is that suing a foreign government is extremely difficutlt even if congress waives sovereign immunity and allows lawsuits. There is an ongoing lawsuit against the Saudi government for the 9/11 attacks from 19 years ago with no settlement in sight.
For reference, Judicial Watch already filed a $20 trillion lawsuit against China based on alleged violations of international bioweapons agreements. Proving a bioweapons violation would be especially difficult since the Chinese government has a pattern of intimidating or imprisoning people who say things that embarrass the government.
Here is a link to an earlier thread on the Judicial Watch lawsuit:
