You can link the “Featured Image” to the “Custom URL” using the Post Grid Combo plugin. This article will help you link the “featured image” to the Custom URL.
To begin, insert the “Featured Image” block.
Click on the “Featured Image” tab.
Now choose “Custom URL” from “Link to” to link the featured image to the custom URL.
To add the custom link, click on the “Custom URL” link button and add the link here.