How can I get the file corresponding to an image I have created on my Mac?

I created a Docker image on my Mac for an application that I want to distribute privately. How can I get the file corresponding to that image? The Docker Desktop lists the image but I cannot find any button to “access” the image. This is a private application - I cannot upload it to Docker Hub etc. Nor do I have the resources to setup a private hub (repository).

Use docker save and docker load