Can we write and call customise fast formula functions

Summary

Fast formula functions

Content

Dear Experts,

I need to know whether we can write customise fast formula functions in Oralce Fusion HCM ?

If yes, how do we do?

For example -->
CALL_FORMULA('CFF_GLOBAL_NOTICE_PERIOD'
,l_per_notified_term_date > 'l_per_notified_term_date'
,l_per_actual_term_date > 'l_per_actual_term_date'
,l_iv_start_date > 'l_iv_start_date'
,l_iv_end_date > 'l_iv_end_date'
,l_iv_duration > 'l_iv_duration'
,l_ldg_new > 'l_ldg_new'
,l_abs_type_attribute > 'l_abs_type_attribute'
,VALID_NEW < 'VALID_NEW' DEFAULT 'DEFAULT'