Can I use the 'index' argument in 'v-for' nested in a 'method'?

I need to use index on a v-for but on the on the same level as thedirectiveitself in order tomutate``` the state being shown.

<template>
  <div>
    <div v-for="share in sharesPurchased(shares)" :key="share">
      <div>
        <h4>This is some content</h4>
        <p style="border: solid 1px">{{share.count | wasPurchased}}</p>
      </div>
    </div>
  </div>
</template>

<script>

  export default {
    data(){
      return {
        shares: [
          {id: 'BMW', count: 1},
          {id: 'Ford', count: 0},
          {id:'Apple', count: 10}
        ]
      }
    },
    methods: {
      sharesPurchased(arr) {
        return arr
      }
    },
    filters: {
      wasPurchased(value) {
        if (value > 0) {
          return value
        }
      }
    }

  }
</script>

I tried applying a filter on the p tag but it obviously did not work. I am sure that this function should all run within the v-for but I did not manage to figure out how to mess with the index as v-for does loop already.

I am leaving this filter in order to explain that I want to show just content with shares[i].count > 0