Hi @sns ,
Yes, only a simple workflow can complete this requirement.
Please check the this post:
https://sharepoint.stackexchange.com/questions/77617/i-need-to-create-an-auto-generated-email-when-items-in-a-sharepoint-list-are-cre
I did a simple test in my SPO environment:
If the answer is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.