After finding Even Better TOML was eating all the memory in VS Code and that it is no longer maintained, I found an improved linter and formatter in Tombi. It

After finding Even Better TOML was eating all the memory in VS Code and that it is no longer maintained, I found an improved linter and formatter in Tombi. It integrates with lots of editors and as a standalone tool with useful schema auto-complete and validation. I've found it fits in well with a Python ecosystem. Best of all the author is really quick to respond to issues.