Custom yaml directives

Hi.

Is there a way to introduce a custom yaml directive into the core without modifying the core itself?
Or is there a way to post-process the yaml values?

Can you explain more what youbare trying to achieve.

@msp1974 I want to let my custom integration to handle reading secrets from a different data source for example. Would that be possible?

If you basically want your integration to read a specific yaml file for data then you can code this into your custom integration to read/write a file.