<template>
Value received from parent aura component to child lwc component ==> <b>{childVariable}</b>
</template>
import { LightningElement, api } from 'lwc';
export default class ChildLWCComponent extends LightningElement {
@api childVariable;
}
<aura:component >
<c:childLWCComponent childVariable="Value sent from parent"></c:childLWCComponent>
</aura:component>