Custom record field and limitation of 4000 characters

Hi,

While creating a custom records field..i cannot write an expression that exceeds 4000 characters and this is also explained in https://docs.appian.com/suite/help/22.2/records-data-sync.html#exceeding-the-field-character-limit

Additionally expression rules are also not supported in custom record fields 

If i have to write a Custom record field that has an expression that exceeds 4000 characters - what other options I have ?? 

Of course trying to make the expression shorter is an option but I am looking for other alternatives other than this.

any help will be appreciated

thanks

jaideep