app_vue2/components/ExpansionPanelComponent.vue

<template>
     <v-expansion-panel>
       <v-expansion-panel-header class="light_grey">
         {{title}}
       </v-expansion-panel-header>
       <v-expansion-panel-content>
         <v-row>
           <slot></slot>
         </v-row>
       </v-expansion-panel-content>
     </v-expansion-panel>
 </template>

<script lang="ts">
    export default {
      props: {
        title:{
          type: String,
          required: true
        }
      },

      setup(){
      }
    }
</script>

<style scoped>

</style>