How to call a local Webhook URL in a Supabase function?

select status, content::jsonb
  into http_status, http_content
  from http_post(
    'http://host.docker.internal:3000/api/my-webhook',
    json_build_object(
      'email', user_email,
      'organization_id', new.organization_id
    )::text,
    'application/json'::text
  );