do not have any good way to store extra properties in a separate file that are not associated with database table

[bharat0249]

Describe the bug

Do not find any way to store extra properties in a separate file that are not associated with database table

To Reproduce

Suppose we have a database table - employee
we will have two classes at angular side - 1) employee.ts and 2) employeebase.ts

We need some more extra properties to use at client side like extraProp1,extraProp2, extraProp3

so now the question is where do we store those extra properties?

we cannot store in above mentioned two classes (employee.ts and employeebase.ts), even if we store, it gets removed when we run rxweb --models -main commmand.