I'm sorry to say it@2izo but there is no documentation about it and we, the maintainers of this project, don't plan to write it because we develop this server for other editors and IDEs, sorry.

However, I moved this to a discussion because other users could help you with that.

You can use my extension:https://github.com/llllvvuu/vscode-glspc . But now Microsoft has their own Python LSP which is probably better supported for VSCode.