What kind of configuration is required, so that WKWebView able to render image files in AppGroup directory?

I have the following HTML string. We want to render image from our app AppGroup.

<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html;charset=UTF-8"/>
        <title>This is title</title>
    </head>
    <body>
        <p><h1>This is title</h1></p>
        
        <div style="font-size: 0">
           <img src="file:///Users/***/Library/Developer/CoreSimulator/Devices/A7B89802-9C65-4512-85A7-51C4372172D0/data/Containers/Shared/AppGroup/14DA3695-BFAF-4096-9F54-2874FD8285C2/attachment/b16c714e-9bb5-4eaa-924e-e043a69088ea.jpeg" width="100%">
        </div>
        
        This is body text
    </body>
</html>

However, if we execute the following code

let html = ...
// wkWebView is WKWebView
wkWebView.loadHTMLString(html, baseURL: nil)

Only text is rendered. The image is not rendered.

May I know, what kind of configuration is required, so that WKWebView able to render image files in AppGroup directory?

Thanks.