Hi, Jake53321
Welcome to Microsoft community.
I understand that you want to create functions in columns in Loop.
I would like to know if you are using a work account or a private account to log into Loop? I have tested it using a private account and unfortunately, at the moment, Loop does not have the option to add functions in columns vs columns.
As for Mermaid, since it is not a Microsoft developed product, it would take a concerted effort between Loop and Mermaid developers to add functions.
Also as a Loop user, I understand that you want to use more functionality in Loop, when Loop can add functions in the created table, it can make Loop more powerful.
Microsoft attaches great importance to user experience, you can submit your ideas and suggestions through the Feedback Hub, and the development team will regularly review submissions for ideas or fixes.
Loop · Community (microsoft.com)
Please share the feedback link here after submitting as it will allow others on the forum to vote for your submission, including me. More votes will lead to more visibility and higher priority to the development team.
Looking forward your reply.
Best Regards,
Mila.L-MSFT| Microsoft Community Support Specialist