How integrate external personal .zip libraries

I see:

WARNING: This command is deprecated and will be removed in the next releases. 
Please use `pio pkg install` instead.
pio pkg -h
Usage: pio pkg [OPTIONS] COMMAND [ARGS]...

Options:
  -h, --help  Show this message and exit.

Commands:
  exec       Run command from package tool
  install    Install the project dependencies or custom packages
  list       List installed packages
  outdated   Check for outdated packages
  pack       Create a tarball from a package
  publish    Publish a package to the registry
  search     Search for packages
  show       Show package information
  uninstall  Uninstall the project dependencies or custom packages
  unpublish  Remove a pushed package from the registry
  update     Update the project dependencies or custom packages