Individual Configuration Settings in RTE editor JSON file are they limited(OOB) or can we customize them?

Hi,

In RTE editor properties as documented there are two types of configuration 1) default supported props 2) Individual Configurations

https://docs.microsoft.com/en-us/powerapps/maker/model-driven-apps/rich-text-editor-control#rich-text-editor-properties

Here in the default supported props structure we can include support configurations from CKE editor also as mentioned.

But there are only few Individual configuration settings mentioned in the site. My question is are they limited and added by Microsoft directly to the environments or those are also customizable as like CKE editor support to default supportedprops structure config ?

https://docs.microsoft.com/en-us/powerapps/maker/model-driven-apps/rich-text-editor-control#individual-configuration-settings

Please any one clarify this question.

Thanks