Preserving comments on pkl eval

I have a PKL template configuration file, and I'd like to ensure that comments are preserved after pkl eval, as the output is the user-facing configuration file. Is there a way to retain the comments in the generated document on pkl eval?

Start by investigating the pkl eval entry point and how it produces the generated document. Determine whether template comments can be retained, and define done as comments remaining in the user-facing output after evaluation.

Written by the indexing model from the issue text.