Custom Hash Field

I’m working on a subscription-based e-commerce site and need to store API keys for an external app. I’d prefer to use Webflow’s built-in User Account profiles instead of hosting a separate database. To ensure security, I’d like to hash the API keys client-side and store them hashed in the user accounts so that they remain hidden from me.

I’ve considered using a “password” field to store them, but there doesn’t seem to be a way to add a custom password field on the User Account profile. I’ve also thought about implementing a JavaScript library like bcrypt to handle the hashing process.

Has anyone implemented a similar solution in Webflow? If so, could you please share your insights or suggest creative alternatives for securely storing API keys within Webflow’s user accounts? Thanks in advance!