How can you get the top level keys returned?

[chicks-net]

I want to get the top-level keys from a TOML file and I've tried:

toml get ./characters.toml 'keys'

but it returns nothing. While if I put this into jq after toml.....

% toml get ./characters.toml '.' | jq 'keys'
[
  "Bea",
  "Duo",
  "Eddy",
  "Falstaff",
  "Junior",
  "Lily",
  "Lin",
  "Lucy",
  "Oscar",
  "Vikram",
  "Zari"
]

So,

• Does anybody know why toml does not support keys?
• Is there any way to do this without jq? (I'm a bit 😦 that we need jq to parse TOML.)
• Is there any documentation reference for what query syntax this tool supports?