How do I a hyperlink an image and add alt text in my Apple Mail signature?

Hello!

I just switched my business email over to Apple Mail from Outlook and am trying to recreate my email signature. I ended up having to screenshot my Outlook signature and drop that image into the Mail signature editor, because the editing capabilities in Mail were too limiting (I just wanted to adjust the character spacing in the text and ensure my logo was properly sized to match - nothing crazy, but not doable in Mail!).

So, since I had to make my entire signature an image, is there any way to hyperlink the image to go to my website? And is there any way to add alt text for the image so that it is accessible for the visually impaired?

I'm using Tahoe 26.6 on a MacBook Air M5.

Thank you!