A transition is not a current state. It's the term used when moving between two statuses in Jira.
What exactly do you mean by a hidden transition? Is this a transition that is not currently possible do to a condition in the workflow not being met right now?
If so, then the REST API endpoint of GET /rest/api/2/issue/{issueIdOrKey}/transitions is actually not designed to be able to show you that.
Get a list of the transitions possible for this issue by the current user, along with fields that are required and their types.
Could you clarify what you are looking for here? I'm not sure I completely understand just yet.
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