Select -f format during imp import

I see -f param belongs solely to the convert.
In case if convert auto: true how to specify
one of the alt formats defined in the config?

Start with the imp import command and the convert command's existing -f option, then inspect how convert auto mode reads alternate formats from the configuration. Done means an import using convert auto can explicitly select one of those configured alternate formats through a documented command-line option.

Written by the indexing model from the issue text.