Use the meta export in your route

import type { MetaFunction } from "@remix-run/node";

export const meta: MetaFunction = () => {
  return [
    {
      property: "og:image",
      content: "https://mosaicimg.com/use?url=yourwebsite.com/your_slug",
    },
    { property: "og:type", content: "website" },
  ];
};