How can I get fixed mean and standard-deviation from layernorm?

Hi, I’m currently working on extracting the mean and standard deviation values from LayerNorm.
I understand that LayerNorm operates as a fixed-weight layer during model inference, so I assume I can extract the fixed mean and standard deviation values.
However, I have only found additional weight and bias objects. Is there any way to obtain these mean and standard deviation values?
Thanks as always.