Hi @koen, I am not sure that google will read that data in the actual file, I think not, but not 100% sure on that. One other thing that you can do, is to create a Rich Snippet for the image, which will link your image, to your business in search results.. You add Google Rich Snippets tags using the custom code panel of the Site Settings in Webflow. You just add your Rich Snippet Meta tags to the HEAD section.
Here is more information on Rich Snippets.
That may or may not work for you, I have not tested the use case for this, if adding a Rich Snippet will help your image show up in Google Images or not...