Input Speed Sensor replaced without needing to replace the entire transmission?

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My 2014 Nissan Sentra began having issues accelerating, especially from a stop. The car would slightly jerk and. I brought it to the dealer and was told the Input Speed Sensor need to be replaced. I was told this means the entire transmission needs to be replaced as the Input Speed Sensor is within the transmission. After some online research, I am seeing some conflicting information about being able to fix the Input Speed Sensor without needing to replace the entire transmission. Does anyone have any advice or expertise on whether the Input Speed Sensor can be replaced without needing to replace the entire transmission? Thank you.