Automatically use another font as the italic type

I've got a question about something that could make my life a lot easier.

I'm using Word in Office 2021 to write documents and I write texts with the Times New Roman font. When I have to write with the italic type, like the name of a book, which I do pretty often, I always use another font: Brush Script MT.

Here's what I'd like to do: it would be pretty handy if I could just write in TNR and turn to Brush Script just by activating the italic knob.

Does anyone know how to do something like that ?