Preload create form with data

Hi
I need to preload a CRUD create form (Add button) with data. What is the best way ?
How can I override the default create action ?

Never had this situation, not possible now i guess, Sorry. I think it would be easy to have more options like beforeCreateCallback in NgRestConfigOptions (https://luya.io/api/luya-admin-ngrest-base-NgRestModel#ngRestConfigOptions()-detail)