Hi,

Odoo Studio offers a basic HTML editor for report customization with options to adjust fields, margins, widths, and text formatting (e.g., alignment, font style, and color). However, it only supports basic HTML and inline CSS. Features like custom fonts, external CSS, or JavaScript require a custom module. To know more about how to generate reports using Studio please refer to the following blog:

https://www.cybrosys.com/blog/how-to-create-custom-reports-with-the-odoo-studio-module

Hope it helps