Hello ;)
I don't think it's possible to do this via the tradiational excel exporter module from Mendix
I would rather try using the Advanced Excel marketplace module
https://marketplace.mendix.com/link/component/116370
Hey Jay,
Excel Exporter module does not provide a lot of customization options.
During the template creation you can go to
Other option is the module Marcian mention in the other answer (Advanced Excel)
Note: Advanced Excel is community support
https://marketplace.mendix.com/link/component/116370
This module offers a whole new level of customization. You can specify the style for each cell in the microflow.
Documentation for this module is sparse, but you can check out this video on YouTube:
https://www.youtube.com/watch?v=HxWTs94vhTo
If this answer helped you, mark as accepted
Best Regards,
Ricardo Pereira