Hi Sashaei,
Good question. Yes, injectable fillers can be used to fill upper eyelid hollows. This is an "off-label" use for fillers such as Juvederm or Restylane. I prefer Restylane over Juvederm, mainly because Juvederm can increase in size by ~10% after the injection. If you do a web search for "Juvederm overfill under eyes," you will find many stories of people who looked good right after the injection, but later the result is too puffy.
Although hollowing of the eyelid area is not desireable, having too much puffiness or "bags" is worse than hollowing. The goal is to fill the area until it looks smooth and flat, but not puffy. It is important to go on the provider's website to see their before and after results, to see if the provider really has experience injecting upper eyelid fillers.
I started treating upper eyelid hollowing initially with fat grafting in 2006. I mainly performed a procedure called "Pearl Fat Grafting" of the upper eyelid hollowing, and still do. However, for younger patients like yourself, who do not need any skin removal, I prefer to inject Restylane as an upper eyelid filler to volumize the "brow skin" or the skin between the eyebrow and the upper eyelid fold/crease.
One key photo to determine if your injector is truly skilled at upper eyelid filling is the photo when the patient looks downwards. If performed properly, it should look very smooth. If injected in the wrong area, it can look lumpy.
I hope this helps to answer your question. Good Luck!
Best,
Dr. Yang