def METHOD_NAME(features):
    """
    Registering the `mark` feature, which uses the `MARK` Draft.js inline style type,
    and is stored as HTML with a `<mark>` tag.
    """
    feature_name = 'redacted'
    type_ = 'REDACTED'
    tag = "span" # This tag is currently 
    # 2. Configure how Draftail handles the feature in its toolbar.
    control = {
        'type': type_,
        'label': '▮',
        'description': 'Redacted',
        # This isn’t even required – Draftail has predefined styles for MARK.
        'style': {
            'background-color': 'currentcolor',
            },
    }
    # 3. Call register_editor_plugin to register the configuration for Draftail.
    features.register_editor_plugin(
        'draftail', feature_name, draftail_features.InlineStyleFeature(control)
    )
    # 4.configure the content transform from the DB to the editor and back.
    db_conversion = {
        'from_database_format': {tag: InlineStyleElementHandler(type_)},
        'to_database_format': {'style_map': {
            type_: {
                    "element": tag,
                    "props": {
                        "class": "d-block redacted"
                    }
                } 
            }
        },
    }
    # 5. Call register_converter_rule to register the content transformation conversion.
    features.register_converter_rule('contentstate', feature_name, db_conversion)
    # 6. (optional) Add the feature to the default features list to make it available
    # on rich text fields that do not specify an explicit 'features' list
    features.default_features.append('redacted'