If you want to include custom fields in your email template from particular mail list you will need to add manually to the email template content.
![](https://www.help.alfasoft.tech/wp-content/uploads/2023/03/include-custom-field-survey-mail-768x561-1.png)
If you have multiple mail lists with custom fields all will be listed here.If the mail list dont have any custom fields wont be listed.