Guix Plover package issue

[Matt]

I'm trying to use plugins with the version of Plover packaged in Guix.
For some reason, Plover isn't showing the plugin interface.  There is
normally a button which says "plugins".  Within Guix, that button
isn't there.

The Plover documentation says that the plugin installer can be accessed through

  plover -s plover_plugins list

This returns an error "no such script: plover_plugins".  It would seem
that the plugin module isn't along with Plover.

AFAICT, plugins are managed by the PyPI package plover-plugins-manager
(https://pypi.org/project/plover-plugins-manager/).  I've run guix
import pypi plover-plugins-manager and tried installing with guix
package --install-from-file.  Trying to follow the errors, I've got:

(use-modules
 (guix build-system python)
 (guix packages)
 (guix download)
 (gnu packages python-xyz))

(package
  (name "python-plover-plugins-manager")
  (version "0.7.1")
  (source (origin
            (method url-fetch)
            (uri (pypi-uri "plover_plugins_manager" version))
            (sha256
             (base32
              "1nwzgcysxcmd7a46w1mjmc2a5gjmhhbx5qhhkas6zdjgdin9c67x"))))
  (build-system python-build-system)
  (propagated-inputs (list python-pip
                           python-pkginfo
                           python-plover
                           python-pygments
                           python-readme-renderer
                           python-requests
                           python-requests-cache
                           python-requests-futures
                           python-setuptools
                           python-wheel))
  (native-inputs (list python-pytest python-pytest-shutil))
  (home-page "https://github.com/benoit-pierre/plover_plugins_manager";)
  (synopsis "Plugins manager for Plover")
  (description "Plugins manager for Plover")
  (license #f))

However, this fails on

ice-9/boot-9.scm:1685:16: In procedure raise-exception:
error: python-plover: unbound variable

Including (gnu packages stenography) doesn't resolve it.  Using guix
edit plover, I see that the definition is in
gnu/packages/stenography.scm. Which module should I be using?

Thank you!