[Query] How to pass parameters to input steps via API

Hi, I was using Jenkins Java client to trigger automation builds externally.

I was able to trigger the build with parameters, but once build is triggered, we need to provide few input parameters like which environment do you like to run your build, On which branch do you like run your tests etc; which are mentioned in Jenkins file.

Is there any way we can pass the input parameters to build once it has been triggered?

These parameters are dynamic and few parameters depend on the input we give during triggering the build. Is there any way to get the list of input parameters that are required?

Any help would be appreciated.

Thanks in advance.