A helpful tutorial from Geeky Gadgets on how to have your AI chatbot help you write email:

To use Bard to write emails in Gmail, you can follow these steps:

• Open Gmail and compose a new email.
• In the bottom left corner of the compose window, click the Help me write button (pencil icon).
• Enter a prompt that describes the email you want Bard to write. For example, you could enter a prompt like “Write a thank-you email to my colleague for helping me with the project,” or “Write a formal email to my manager requesting a vacation.”
• Click the Create button.
• Bard will generate a draft email based on your prompt. You can then review the draft and make any necessary edits.
• Once you’re happy with the draft, click the Send button.

Lots more great tips in that tutorial. Read it here.