{  "@context": "https://schema.org",
  "@type": "BlogPosting",
"mainEntityOfPage": {
    "@type": "WebPage",
    "@id": "my_website_url"
  },
  "headline": "Hello World",
"image": [
    {
      "@type": "ImageObject",
      "contentUrl": "my_image_url1"
    },
    {
      "@type": "ImageObject",
      "contentUrl": "my_image_url2"
    },
    {
      "@type": "ImageObject",
      "contentUrl": "my_image_url3"
    },
    {
      "@type": "ImageObject",
      "contentUrl": "my_image_url4"
    },
    {
      "@type": "ImageObject",
      "contentUrl": "my_image_url5"
    }
  ]
}

 {  "@context": "https://schema.org",
  "@type": "BlogPosting",
"mainEntityOfPage": {
    "@type": "WebPage",
    "@id": "my_website_url"
  },
  "headline": "Hello World",
"image": [
 "my_image_url", "my_image_url2", "my_image_url3"]
}