There's no relevant dropdown. This information, if listed in Box 14, is informational only. The taxation is already built into the numbers on your W2, so no adjustment occurs on your return.
You can ignore it, or enter as Other-Not on List. Both have the same effect, which is no effect.
Your Federal and NJ wages on the W2 should already be properly calculated to reflect the proper tax treatment. These contributions are tax deductible for federal, and not for state. Your NJ wages will be higher than federal due to NJ's taxation of 414(h), 403(b), HSA, health insurance, and more.
