Translation message can not contain stringified json

I am new to nuxt. I installed i18n to handle translations

i checked https://i18n.nuxtjs.org/docs/getting-started

my defineI18nConfig:

nuxt-app/i18n.config.ts

export default defineI18nConfig(() => ({
    legacy: false,
    locale: 'en',
    fallbackLocale: "en",
    escapeParameterHtml: false,
    warnHtmlMessage: false,
    messages: {
        en: {

            welcome: "hello dear human {\"key\": \"value\"}"

        },
        fr: {

            welcome: "hello dear human fr"

        }
    },
}))

pages/index.vue

<script setup>


const { locale, setLocale } = useI18n()
</script>
<template>
  <div>
    <div>
      <button class="btn ml-3" @click="setLocale('en')">en</button>
      <button class="btn ml-3" @click="setLocale('fr')">fr</button>
      <p>{{ $t('welcome') }}</p>
    </div>
  </div>
</template>

Error:

Message compilation error: Invalid token in placeholder: '"key":'
1  |  hello dear human {"key": "value"}

My problem i have some json examples in my translations that i can not delete

i imported i18n in config,

modules: ["@nuxtjs/i18n"],

  i18n: {
    vueI18n: './i18n.config.ts'
  }

It is possible to have json in translates or not ?

const i18n = VueI18n.createI18n({
  locale: 'en',
  messages: {
    en: {
      hello: `hello world {'{'}"key": "value"{'}'}`
    }
  }
})

const app = Vue.createApp()

app.use(i18n)
app.mount('#app')

<script src="https://unpkg.com/vue@3"></script>
<script src="https://unpkg.com/vue-i18n@9"></script>

<div id="app">
  {{ $t('hello') }}
</div>

use {'@'} for the placeholder

see vue-i18n Literal interpolation