Conda environment.yml - automatically add environment and extensions to Jupyter

Question

Whenever I install a sample environment.yml, say:

name: my_env
dependencies:
  - python
  - numpy
  - pip:
    - scipy
    - ipykernel
    - ipywidgets

that I install by conda env create -f environment.yml I then always have to add it to the Jupyter "kernelspec":

python -m ipykernel install --user --name my_env --display-name "my_env"

and enable extensions:

jupyter nbextension enable --py widgetsnbextension

It would be simpler to have these two steps part of the environment.yml to start off with. Is this possible?