Thanks Again @Gassim ,
I try to get patient personal information from government system like (Ministry of Interior) just when user fill patient id and press a button then get all patient data and fill it on form input.
another example:
I need get all patient lab result from lab and store it on a patient stage same before using button to get all data and fill it on form input filed.
this allow to us to help users to use DHIS2 in quick way without build 3-party system, just inside custom form in DHIS2 and make DHIS2 powerful in connecting with other system.
I suggest this ticket below for DHIS2 team but still no answer