Adding Value Masking in an ASM JSON Profile via API

The article "Masking data in the BIG-IP ASM request log (f5.com)" describes a way to mask sensitive parameters in the ASM logs. We appreciate that feature and would like to use it. But instead of adding the element names through the UI, we would like to do this via an API.

I've tried to find an endpoint and hoped that the default iControlREST endpoint for JSON-profiles (https://my.bigip/mgmt/tm/asm/policies/<policy-id>/json-profiles/<profile-id>) would do it, but it doesn't show the parameters.

Is anyone aware of a way to do it via a script or so?

Thanks in advance!