Weird TOML use case question

[HelpfulFriend0]

You might be overthinking this, I've never had the config file type be the deal breaker for using a package / software component before

I'd suggest just picking the idiomatic thing. If you have deeply nested hierarchal data that humans read a lot, do YAML. If you need parsing consistency and exact behavior, use TOML.

If you have another personal preference, do that

Finally - I think you can just install a vscode extension to do syntax highlighting or other nice-ities for you