You can write your own searchhelp function.
Two examples are to be found in the documentation on InputField, section "Programmed matchcode help".
I suggest you proceed as follows:
- Find out which function is used in the SAP system to display the seachhelp
(use ABAP debugging)
-Test the appropriate parameterization of this function with SE37, test
- Write an ABAP exit program like the one shown in Example 2 of the keyword