SOURCE

const App = {
    setup() {
        const getKey = (prefix, id) => {
            return `${prefix}-${id}`
        }

        const createData = (
            maxDeep,
            maxChildren,
            minNodesNumber,
            deep = 1,
            key = 'node'
        ) => {
            let id = 0
            return Array.from({ length: minNodesNumber })
                .fill(deep)
                .map(() => {
                    const childrenNumber =
                        deep === maxDeep ? 0 : Math.round(Math.random() * maxChildren)
                    const nodeKey = getKey(key, ++id)
                    return {
                        id: nodeKey,
                        label: nodeKey,
                        children: childrenNumber
                            ? createData(maxDeep, maxChildren, childrenNumber, deep + 1, nodeKey)
                            : undefined,
                    }
                })
        }

        const props = {
            value: 'id',
            label: 'label',
            children: 'children',
        }
        const data = createData(2, 30, 40)
        return {
            data
        }
    }
};
const app = Vue.createApp(App);
app.use(ElementPlus);
app.mount("#app");

<!-- <script src="https://cdn.bootcdn.net/ajax/libs/vue/3.2.47/vue.global.js"></script> -->

<script src="https://unpkg.com/vue@3"></script>
<!-- import CSS -->
<link rel="stylesheet" href="https://unpkg.com/element-plus/dist/index.css">
<!-- import JavaScript -->
<script src="https://unpkg.com/element-plus"></script>


<div id="app">
    <el-tree-v2
        style="max-width: 200px"
        :data="data"
        :props="props"
        :height="400"
    />
</div>