Apple touch icon problem

Hello, I realize for my company an IOT project and the use on smartphone is important therefore, I want to be able to add the web page on the home page of smartphones.

My problem is that I can't add an icon for it and my device (Iphone Xr) uses a dynamic image of the page.

To insert it, I use :

For information Node-Red runs on a Windows 10 distribution, thank you in advance for your response and best regards.