How to reference self in event configuration parameters

[asher_hounsell]

As seen in the image below, is there a way to self reference custom props in the value section (the way seen below does not work) without referencing the specific block to avoid having to change these manually for many more to come. Alternatively having a property in this would also function the same way. Thanks!

[asher_hounsell]

{this.custom.x}