Thank you for reaching out to the Community! I can definitely understand how helpful it would be to have a click-to-call button or image. A phone number written as text is able to become a clickable link in certain email clients because mobile devices automatically hyperlink anything in a phone number format. I apologize at this time, being able to add a click to call link for text and images is not currently an available feature. I have however tracked your feedback on having a feature like this.
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