How to add extension settings to devcontainer.json?

In a Codespaces .devcontainer/devcontainer.json file I may have the following:

"customizations": {
  "vscode": {
    "extensions": [
      "snowflake.snowflake-vsc"
    ]
  }
}

and in the Codespaces VS Code environment, I copy a setting I want to persist for all Codespaces environments, e.g.

"git.autofetch": true

I should note here that git appears to be a default extension either with VS code or the miniconda dockerfile base image I'm using. In any case, I think these two quoted concepts are related, or maybe they're not exactly, but I can't seem to find any guidance on how to actually persist the git setting. Any takers?

You cannot directly define extension settings in the devcontainer.json. But if you need these settings to be version controlled and persistent, they can be defined in .vscode/settings.json

{
"git.autofetch": true
}