A group of Microsoft Products and technologies used for sharing and managing content, knowledge, and applications.
Dear Daniela Barros1,
Thank you for reaching out to the Microsoft community. We are delighted to offer our assistance.
Yes, it is possible to add a tooltip for a choice column in Microsoft Lists. But, there is no built-in way to do this in SharePoint. You can use Power Apps to create a custom form for your list and add a tooltip to the choice column. We'd love to help, but considering we primarily focus on general and embedded queries in Microsoft 365 apps, we may have limited resources on Power Apps.
At the same time, considering that we have a dedicated channel Power Apps Community Power Apps Community - Power Platform Community (microsoft.com), in order for you to receive the right support, we sincerely recommend that you go to that community and post a new thread, the members and engineers there will focus on the specific situation on your side and share specific suggestions. We are confident that our experts on that team can take care of your query effectively and accurately.
Thank you for your understanding and cooperation! I hope you stay safe and healthy always.
Sincerely
Sean | Microsoft Community Moderator