How to use it in Open Edx?

It used plugin slot, and to make it works properly ensure to install and import in specific MFE. Each MFE probably has different version of dependencies.

from tutormfe.hooks import PLUGIN_SLOTS
from tutor import hooks


hooks.Filters.ENV_PATCHES.add_item(
    (
        "mfe-dockerfile-post-npm-install-authoring",
        """
# npm package
RUN npm install wowot-button-package --save
""",
    )
)

hooks.Filters.ENV_PATCHES.add_item(
    (
        "mfe-env-config-runtime-definitions-authoring",
        """
const { GenerateCourseButton } = await import('wowot-button-package');
""",
    )
)



PLUGIN_SLOTS.add_items([
    (
        "authoring",
        "org.openedx.frontend.authoring.course_outline_header_actions.v1",
"""
{
  op: PLUGIN_OPERATIONS.Insert,
  widget: {
    id: 'extra-button',
    priority: 60,
    type: DIRECT_PLUGIN,
    RenderWidget: GenerateCourseButton
  }
}
"""
    )
])