I don't know if it is specially trained for kneeling. However, it is worth noting that China people may have a wrong understanding of kneeling in Japanese restaurants. In Japan, sometimes it is just a habit for waiters to serve food on their knees, or for the convenience of serving food, which is not as condescending as in China. Tatami is spread out in authentic Japanese-style rooms (including some Japanese restaurants), and the table for eating is short, so you can't reach the desktop when standing. Kneeling is the most convenient way to serve food. Japanese often kneel at home. This stems from the fact that traditional Japanese families have no furniture such as stools and chairs. Of course, Japanese living habits have changed now, and western-style furniture such as sofas have entered Japanese families, but they still have the habit of eating on their knees.

If some Japanese restaurants in China specialize in kneeling service, it is actually a bit of a toddler. If the store is not tatami but a high table, it will be funny to serve food on your knees.