You can try something like this:
font-size: 12px !important;
Add the above class to where the font is.
More here: Outlook Conditional CSS | Email Design Reference.
Hey thanks! It works on the email editor end. I did try cloning the template to create a new one where I can add this as well but it doesn't save after doing so. Can this not be added on the template end?
Actually I figured out for the template. Thanks again!