Custom schema problem

My custom schema validation is ok on Google rich snippets test, but its not produce the “itemReviewed” item in my website source code.


{
"@context": "https://schema.org",
"@graph": {
"@type": "AggregateRating",
"ratingValue": "5.00",
"bestRating": "5",
"ratingCount": "%term_count%",
"itemReviewed": {
"@type": "ProductCollection",
"name": "%title%"
}
}
}


https://search.google.com/test/rich-results/result?id=rr279h6vfKmJgd02nrPyXA

Website source code:


{"@type":"AggregateRating","ratingValue":"5.00","bestRating":"5","ratingCount":"33"}


https://search.google.com/test/rich-results/result?id=-eofdBnRU8dBr5MSC5q0zg