Step 1: In Theme customize, go to the Product page > Default product > Product summary, you guys will see the Use variants image group option here:
Step2: Go to Products select product you would like to add Variant Image Grouped
Step3: Copy the colors of Variant section
Step 4: Click on image product -> Paste name of the variant color on “Image alt text” section of a product image.
Here is the result: Demo
