.chezmoi.$FORMAT.tmpl
If a file called .chezmoi.$FORMAT.tmpl exists then chezmoi init will use it
to create an initial config file. $FORMAT must be one of the supported config
file formats, e.g. json, jsonc, toml, or yaml. Templates defined in
.chezmoitemplates are not available because the template is executed before
the source state is read.
Example
~/.local/share/chezmoi/.chezmoi.yaml.tmpl
{{ $email := promptString "email" -}}
data:
email: {{ $email | quote }}