custom-input-8.js

<!-- CustomInput.vue -->
<template>
...
    <input type="text" :name="name" v-model="model" />
...
</template>

<script>
...
  computed: {
    ...
    model: {
      get() {
        return this.value;
      },
      set(value) {
        this.$emit('input', value);
      },
    },
  },
...
</script>