This python package is made for adjusting plotting templates of matplotlib, plotly and altair. To see how it works, check out the tutorial.ipynb to see it in use! :)
For PowerBI, adjust richview_powerbi.json to your liking - details here: https://learn.microsoft.com/en-us/power-bi/create-reports/desktop-report-themes#report-theme-json-file-format
Go to the tutorial.ipynb and play with it. Adjust richview.mplstyle and altair.py and plotly_theme.py to generate styles that you love! Once done, sipmly run pip install . That will install the package and you can use it in your own code.
Adjust the R_Theme to your liking to generate charts of your liking