How do I apply my company styles (fonts, colors, visualization properties) on Jupyter notebook output file (.ipynb)
You can look into creating a new theme for JupyterLab using this cookiecutter: https://github.com/jupyterlab/theme-cookiecutter
Otherwise if you are processing notebooks, you can use nbconvert and export them with a custom template: https://nbconvert.readthedocs.io/en/latest/