No, you don't have to report your UK pension until you begin taking withdrawals from it.
If your state of residence at the time allows a pension exclusion on all or part of your retirement income, you can create a Substitute 1099-R to report it (Form 4852).
You may or may not be able to Efile with this form. Users have reported both outcomes.
If you state doesn't give a Pension Exclusion, the easiest way to report is as 'Other Miscellaneous Income' with a description of 'Foreign Pension'.
You will be able to Efile and the income is taxed the same in either method.
If you paid Foreign Tax on your distributions, you can claim a Foreign Tax Credit, which is also able to Efile.
Click this link for more discussion on both ways of Reporting Foreign Pension Income.
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