I believe you can use the ACS SDK / API to do that. You can `aio app init` with the Campaign template, which shows you how to use and work with the Campaign SDK, then try the following call to update your profile.
Here's the update profile call from the SDK https://github.com/adobe/aio-lib-campaign-standard#CampaignStandardCoreAPI+updateProfile.
Here's a code lab for viewing profile in ACS that might be helpful for you to understand how to connect to ACS in Firefly. https://adobeio-codelabs-campaign-standard-adobedocs.project-helix.page/?src=/README.html