Hello @tomm1p ,
To do this you have to customize the code part.
If these tabs are with theme product page settings then add a new option there to upload image or if it supports html then you can directly image there using img tag.
If these options are with metafields then the same here you have to add a new option here to upload image and after that call it in template.
Note: To edit templates it must be necessary that you have liquid knowledge else try to ask theme support or developer.