gltf_bl_properties.py (Source)

class WatermarkingExtensionProperties(bpy.types.PropertyGroup):
    !\textbf{enabled}!: bpy.props.BoolProperty(
        name="glTF Export Watermarker Extension",
    )
    !\textbf{watermark}!: bpy.props.StringProperty(
        name="Watermark image",
    )