We have TOML in the sense that TOML is currently v0.4.0 and bears an explicit warning that the specification is unstable should be treated accordingly.
That's unfortunate, but there are a lot of projects out there that depend on TOML, and it hasn't changed since 2015. It's de facto stable at this point.
The author has said as much: https://github.com/toml-lang/toml/issues/330