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- Phone number format: You would need to do it using a script that parses the string and adds the extra characters to it.
- Text font: Not possible. The message can only be in plain text.
You cannot add bold/italics/underlined or any other formatting options to the email message. It's all just normal text.
var phoneNumber = util.printx("(999) 999-9999", this.getField("YourPhone").valueAsString);
If you want to learn more about the util.printx() method, it's described in the API documentation: Acrobat DC SDK Documentation