[Vuejs]-Select row in q-table with button using Vue.js

<q-input v-model="note" label="Note" outlined></q-input>

where is you "note" data ?

If I understood correctly, I would have created something like that:

<template>
    <q-table
        title="Students"
        :filter="filter"
        :rows="studentsData"
        :columns="columns"
        row-key="id"
        dense
        selection="single"
        class="puffy-shadow rounded q-pa-lg students-table"
        v-model:selected="selectedStudentRow"
    >

<template v-slot:body-cell-actions="props">
        <q-td :props="props">
          <q-btn class="action-btn" color="green" icon="mdi-pen" @click="openStudentDialog(props.row)">
        </q-td>
      </template>
</q-table>

<q-card>
        <q-card-section>
          <q-form>
            <q-input v-model="selectedStudent.note" label="Note" outlined></q-input>

        </q-card-section>

</q-card>


[......]
data(){
    return{
      studentDialog: false,
      selectedStudent: {}
    }
  }, 

methods: {
openStudentDialog(student){
    selectedStudent = student
    studentDialog = true
}

something like that