How to call a FM inside FOR loop with new ABAP syntax?

Hi experts,

I have a requirement to call a FM inside the FOR Loop with the ABAP 750 syntax.

Basically what I want to know is how do I code the below requirement using a FOR Loop, if it is possible.

LOOP AT itab INTO wa.
  CALL FUNCTION 'X'
    EXPORTING
      e_param = wa-field
    IMPORTING
      i_param = wa-field.
  wa_range-sign = 'I'.
  wa_range-option = 'EQ'.
  wa_range-option-low = wa-field.
  APPEND wa_range TO lr_range.
ENDLOOP.

I'm trying to do something like the below code. But, I want to pass wa-field to a conversion FM before creating the range table.

DATA(lr_range) = VALUE lr_range(
                                FOR wa IN it_tab (
                                          sign = 'I'
                                          option = 'EQ'
                                          low = wa-field
                                  )
                                ).

How do I achieve this inside the FOR Loop?

Please advise. Thanks :)