The first time I saw an e-commerce app offering an image search feature was on Taobao. This feature was later also integrated by Shopee and Lazada where users can search for something on the e-commerce site using the camera. Most recently, this feature was introduced on the TikTok Shop.
A camera icon appears on the TikTok Shop search bar. When pressed, the camera can take a picture of any object for the system to identify the same or similar items that can be purchased in the TikTok Shop. More or less the same feature can also be found on Google Lens.
In my tests, the displayed search results were quite fast. TikTok also released a small window with Matched, Best Selling and Price (sorted) categories. This feature is seen to be available in Malaysia on the TikTok app for Android and iOS but is said to still not be offered in all countries yet.