How do I add a subtitle to the slide?

[MassMessage]

my slide looks like this https://codesandbox.io/s/swiper-autoplay-react-forked-7m2fw9?file=/src/App.jsx
but I can't find how to add a subtitle... is this supported natively? i've tried something like

        <SwiperSlide title='teste'>
          <img src="https://swiperjs.com/demos/images/nature-1.jpg" />
          <h1>test...</h1>
        </SwiperSlide>

but it didn't show my h1 over the image... how do i do that?