You can use the command line to perform a diagnosis of your workspace and export the results to a file. This report will use the .luarc.json in the target workspace (unless otherwise specified with --configpath)
The command should look like this:
lua-language-server --check E:\programming\myLuaProject --checklevel=Warning
The server will exit once the report is complete. The report will be written to check.json in your logpath (unless otherwise specified with --logpath).
The check command will start a virtual client that opens all files in the target workspace, retrieves all diagnostic info, and writes it to a file.
Since each file is being opened, "Opened" has the same effect as "Any" for
Lua.diagnostics.neededFileStatus
and
Lua.diagnostics.groupFileStatus.