Hello Yu Jessie,
Welcome to the Microsoft community.
I have understood your issue. Unfortunately, the Loop component is currently only available for Outlook for Windows as well as the web side, the Outlook app on mobile is currently not available for this feature.
Overview of Loop components in the Microsoft 365 ecosystem | Microsoft Learn
If you have any requirements and suggestions, you can give feedback to the development team via the link below.
Ideas · Community (microsoft.com)
Sincerely
Carlos - MSFT | Microsoft Community Support Specialisto