It's easy! Implement an App Proxy in your application. This allows you to establish a designated endpoint for accessing your app. By sending an Ajax GET request with an ID from the blog page to your app, you can retrieve dynamic content tailored for your needs. The response can be formatted either as Liquid or JSON. Opt for Liquid and Shopify will handle the rendering automatically; choose JSON and manipulate your data within a template.
The added benefit is that this process creates a secure callback link between your app and Shopify, ensuring no security complications or concerns. To access this feature, navigate to Extensions within your app settings and activate Online Store to start configuring the Proxy settings.