How can i using data binary on pipeline???

edit

Hello I am not good at English, so some misinterpretation may come out and I ask for your understanding in advance.

I run the following curl command

curl -X POST '{streamsetsIp}:18630/rest/v1/pipeline/{PipelinID}/start?rev=0' --user {UserId}:{UserPW} -H 'X-Requested-By:sdc' -H 'Content-Type: application/json;charset=UTF-8' --data-binary '{"iwantdata": "thisdata!!"}'

i want use 'iwantdata' in my datacollector

i try ${iwantdata} <- but this is error ㅜ.ㅜ

I want to know how to get the runtime parameter value at the same time as it runs in the pipeline