Record type - new custom record field

Certified Senior Developer

Is there any way we can use related record type field or expression rules while creating custom record field in a Record type with data sync on? When I am creating a new custom record field and trying to write my own expression, it's not allowing me to use any expression rule. Also I am not able to use any field from the related/mapped records. 

It is restricting me to create user filter based on custom record field.

Any help would be appreciated. Thanks in advance.

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