As title described, below is my flow.
And this is the email I received. The timeline chart can not be displayed correctly.
Hi @Owen_sheng
1.In the body section, select the code view icon.
2.In the Body field, insert the required BodyHtml so that the visualized result of the query is included in the body of the email.
3.To add an attachment to the email, add Attachment Name and Attachment Content.
I think this link will help you:
Usage examples for Azure Data Explorer connector to Power Automate | Microsoft Learn
Best Regards,
Levi