he/him 
Rome config option names
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In order to know what the configuration is, you have to execute the script, it can do literally anything. No idea about autocomplete but VS Code has it for JSON so don't see why it couldn't have it for TOML.
Even with a TS config file, you would still need to import the types, which requires additional project setup, and now the tool needs to have the execution environment as a part of it's public API. Is it loaded with just `node`, does it have access to other internals etc etc.