I would like to add custom HTML/Templates to my Dash app I have created. I was wondering if thats possible in a Dash app in R?

I have built a Dash app within R for dashboard purposes and want to import custom HTML/Javascript/CSS for a couple of pages within the dash app. I assume this is possible within Python, is it with R as well and how would I do such? I guess while on the topic, how would I do such with Python as well?

Thank you for your time and looking forward to your answers!