Hi Tat,
This is not available in Arc as a property of the process, as it was in Architect.
However, you can use the SetUseActiveSandboxProperty(value); function in any process to get the same effect.
It looks like the REST API doesn’t support setting a UseActiveSandbox property on the Process object, so it might be a challenge to implement it this way in Arc.
As always, though, you’re welcome to submit an enhancement request and we’ll see if we can find a way to do it.