Hi.
As noo e else replied yet: no, that is not possible at the moment. If you need the standard deviation of a large set (ie maby minibatches), you could multiply the standard deviation of mini-batch-averages by batch_size**0.5 to estimate the per-sample standard deviation using the CLT scaling behaviour.
There is a way to get  stdev for linear layers with a bit of hackery, but conv layers seem out of (my) reach at the moment.
Best regards
Thomas