wmsettings.links.menu.yml

wmsettings.settings:
    title: 'WmSettings'
    description: 'Configure wmsettings'
    route_name: wmsettings.settings
    parent: system.admin_config
    weight: 20

wmsettings.content:
    title: 'Settings'
    description: 'Configure site-wide settings'
    route_name: wmsettings.content
    parent: system.admin_content
    weight: 20

wmsettings.content.settings:
    parent: wmsettings.content
    deriver: Drupal\wmsettings\Plugin\Derivative\SettingsMenuItemsDeriver