Rabbits can eat fresh herbs like parsley ... with leafy greens and other fruit and veg fed alongside their feed and hay.
In that sense, hay or grass is far more important than even the best food for rabbits and the higher the quality you buy, the better it will be for your pet and the more likely they are to eat it.
Instead, rabbits should be given hay daily. It's their main food, and the amount of hay they eat should be similar to their body size. Hay keeps their teeth, which are constantly growing ...