I don't see why not as long as it's strongly supported. A lot of people build their coops off the ground for ease in cleaning and the chickens like to hang out underneath for the shade.
A coop should be higher off the ground. Chickens like to gather underneath (maybe add some windbreaks) and it makes it more difficult for predators to get inside. Make sure the ramp isn’t too steep!
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Your chicken coop can be how ever high or low to the ground you want it to be.
There are no set rules...it's all preference.
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Also make sure it is well anchored so that it can't be tipped or blown over by strong winds. My coop is on stilts and we opted to bury the legs close to 20 inches to be sure the whole thing is stable.
A lot of chicken tractors and smaller coop/run combinations have the coops that high off the ground. The chickens don't care (and in fact may actually like getting up higher, especially when they're heading in to roost).
Hi Kenny and welcome to BYC. I have one coop that is 1m off the ground. The door open downwards, increasing square footage and negating the need for a ramp as the birds simply fly onto the opened door and then walk into the coop.