How to add schema markup to the body of the site, so as not to swear?

Question

HTML

The theme is this.
I want to insert the following script in the body:

<script type="application/ld+json">
{
    "@context": "http://schema.org",
    "@type": "LocalBusiness",
    "name": "Автомобили с пробегом в Калининграде от официальных дилеров.",
    "address": {
        "@type": "PostalAddress",
        "addressLocality": "Калининград",
        "addressRegion": "RU",
        "postalCode": "238311",
        "streetAddress": "Московский проспект, 270"
    },
    "image": "https://ottokar39.ru/img/logo.svg",
    "email": "[email protected]",
    "telephone": ["[phone]", "[phone]"],
  "priceRange": "100000 - 1600000",
    "url": "https://ottokar39.ru/",
    "paymentAccepted": [ "cash", "credit card", "invoice" ],
    "openingHours":["Mo 9:00-20:00","Tu 9:00-20:00","We 9:00-20:00","Th 9:00-20:00","Fr 9:00-20:00","Sa 9:00-20:00","Su 9:00-20:00"],
    "openingHoursSpecification": [
        {
        "@type": "OpeningHoursSpecification",
        "dayOfWeek": "http:/schema.org/Monday",
        "opens": "9:00:00",
        "closes": "20:00:00"
        }
,        {
        "@type": "OpeningHoursSpecification",
        "dayOfWeek": "http:/schema.org/Tuesday",
        "opens": "9:00:00",
        "closes": "20:00:00"
        }
,        {
        "@type": "OpeningHoursSpecification",
        "dayOfWeek": "http:/schema.org/Wednesday",
        "opens": "9:00:00",
        "closes": "20:00:00"
        }
,        {
        "@type": "OpeningHoursSpecification",
        "dayOfWeek": "http:/schema.org/Thursday",
        "opens": "9:00:00",
        "closes": "20:00:00"
        }
,        {
        "@type": "OpeningHoursSpecification",
        "dayOfWeek": "http:/schema.org/Friday",
        "opens": "9:00:00",
        "closes": "20:00:00"
        }
,        {
        "@type": "OpeningHoursSpecification",
        "dayOfWeek": "http:/schema.org/Saturday",
        "opens": "9:00:00",
        "closes": "20:00:00"
        }
,        {
        "@type": "OpeningHoursSpecification",
        "dayOfWeek": "http:/schema.org/Sunday",
        "opens": "9:00:00",
        "closes": "20:00:00"
        }
    ]
}
</script>

My programmer tells me:
- it doesn't compile in the body of the page...
- it doesn't compile in the head either...
- it throws an error. I clean everything works ...
- I insert the script into the page, the page does not load ...
- it seems to me that the question is in the @ symbols in the code. In razor, this is a special character that indicates the beginning of a piece of program code...
Website - ottokar39.ru
ASP.NET + C#
First question: what could be the problem? Where to dig here?
Second question: If you connect this script to the page as a separate script file, will the robots see this markup? If so, what additional things can be done there to be seen for sure? And how to check it?