Yes, you can dynamically pass parameters to a GET request using our urlload command. Please refer to the illustration below and let me know if you need further assistance.
Count: {formtext: name=count; default=5}
{urlload: http://www.randomnumberapi.com/api/v1.0/random?min=100&max=1000&count={=urlencode(count)}; done=(res) -> ["data": catch(fromJSON(res), "No data available")]}
Random numbers: {=data}