How to scope querySelector to component in Svelte?

I have this component, andI would like to do some manipulations on its children elements in ways that are not feasible in a state-driven way. So I would like to use a statement and a querySelector in it. But how can I scope it to the element? There are multiple instances of the component in the page, so a class or id is not possible. How can I achieve this?

Here's a simplified code:

<script>      export let value = ''      export let readonly = true      $: if (value && !readonly){      // selects the first element in the document, not the one from this instance       const nd = document.querySelector('.forminput')      // Do something with nd    }</script><textarea bind:value wrap="soft" rows="1" class="forminput"></textarea>