Thanks for the link! Yeah editorconfig is definitely a move in the right direction, but there are still the problem with LSP mentioned in the blog post which editorconfig does not address - Many language servers take in project-specific configuration for the language server itself and at the moment this is not standardized anywhere to declare it in a generic way.
Precisely, .editorconfig has a project scope and is recognized by a multitude of IDEs and editors. Perhaps you should talk to the authors of .editorconfig to find out if what you want can be carried by their project.