I was trying to find out how to use this plugin.

pinia-plugin-persistedstate

Using Option Stroe -> similar syntax to composition API.
And now i found out hope this will help someone.

For more go and read more docs at:
https://pinia.kimyang.cn

Main.ts

import { createApp } from 'vue'
import { createPinia } from 'pinia'
import piniaPluginPersistedstate from 'pinia-plugin-persistedstate'

const app = createApp(App)
const pinia = createPinia()
pinia.use(piniaPluginPersistedstate)
app.use(pinia)
app.mount('#app')

pinia

sampleStore.ts

import { reactive } from 'vue'
import { defineStore } from 'pinia'

export const usePiniaStore = defineStore('piniaStore', ()=>{
    const data = reactive({
        count: 0,
        examples: []
    });

    const addCount = () => {
        data.count += 1;
    }

    const getCount = ()=> {
        return data.count;
    }

    return { data, addCount, getCount} 
},
{
    persist: true,
});