I'm making an email template in Google Docs so that I can copy and paste this into email body. So far, everything works great except when the email is opened in mobile devices with dark mode enabled, my logo (designed to be used in light background) doesn't look good. I have a logo with dark theme but I have a trouble implementing it into the template.

My guess would be converting this document into HTML first, modify the code, export it as HTML file, open it in a browser, Copy&Paste.

But the reason I'm doing this in Google Docs is bc HTML template was too much pain for me and it defeats the purpose. Is there any other ways I can achieve this?