According to the laws of Hong Kong, all foods sold publicly in Hong Kong, except for a few special circumstances, must be marked with various nutrients on the packaging in accordance with the prescribed unified format. This is the "nutrition label".

According to what you said, "snacks" should belong to this special situation:

The total surface area of the package is less than or equal to 100 cm2, or the maximum surface area is less than or equal to 20 cm2.

I don't know. Generally speaking, it can be considered that it is less supervised than other people who are not exempted.