Add JSON-LD to store product pages

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Hello,
i have a similar problem, with this code the console give to me this error:

Someone can help me?
Cannot read property ‘aggregateRating’ of undefined (oin this line singoleRecensioni [ 0 ][ “aggregateRating” ][ “@type” ]= “AggregateRating” ; )


import wixLocation from 'wix-location';
import wixSeo from 'wix-seo';
import wixData from 'wix-data';


$w.onReady(async function () {
    initBrand();
 
  wixLocation.onChange(async (location) => {
    initBrand();
 })
})

async function initBrand() {
 let structuredData = wixSeo.structuredData;
    console.log(structuredData); // inspect structuredData
let singoleRecensioni=[];
let mediaVoti=0;
let totaleVoti=0;

  wixData.query("Recensioni")
 .eq("lingua", "IT")
 .eq("prodotto", "Omega 15")
 .find()
 .then( (results) => {
      totaleVoti=results.items.length;
 let somma=0;
 for (let  i=0; i<totaleVoti; i++ ){
        singoleRecensioni[i+1]["@type"]="Review";
        singoleRecensioni[i+1]["name"]=results.items[i].titolo;
        singoleRecensioni[i+1]["reviewBody"]=results.items[i].descrizione;
        singoleRecensioni[i+1]["reviewRating"]["@type"]="Rating";
        singoleRecensioni[i+1]["reviewRating"]["ratingValue"]=results.items[i].valutazione;
        singoleRecensioni[i+1]["datePublished"]=results.items[i].data.getFullYear()+"-"+results.items[i].data.getMonth()+"-"+results.items[i].data.getDay();
        singoleRecensioni[i+1]["author"]["@type"]="Person";
        singoleRecensioni[i+1]["author"]["name"]=results.items[i].autore;
        singoleRecensioni[i+1]["publisher"]["@type"]="Organization";
        singoleRecensioni[i+1]["publisher"]["name"]="Omega Stations";
        somma+=results.items[i].valutazione;
 }
    mediaVoti=somma/totaleVoti;
    console.log(singoleRecensioni);
 } )
 .catch( (err) => {
 let errorMsg = err;
 } );
  singoleRecensioni[0]["aggregateRating"]["@type"]="AggregateRating";
  singoleRecensioni[0]["aggregateRating"]["bestRating"]=5;
  singoleRecensioni[0]["aggregateRating"]["worstRating"]=1;
  singoleRecensioni[0]["aggregateRating"]["ratingCount"]=totaleVoti;
  singoleRecensioni[0]["aggregateRating"]["ratingValue"]=mediaVoti;
  structuredData[0] +=singoleRecensioni;
  console.log(structuredData); // inspect structuredData
 await wixSeo.setStructuredData(structuredData);
}