Want to use moodle default core webservices in Joomdle

I want to use core moodle webservice in Joomdle. For example, I want to use the core webservice like "mod_assign_get_assignments" & "mod_scorm_get_scorms_by_courses" on joomdle. Is it possible to work? If Yes, How can I implement the code please help me guys, I am very new to joomla and joomdle.

You would need to check Moodle documentation for that, as this would not be related to Joomdle.

I already worked with moodle core functions using core PHP. In my new stuff I need to add the moodle core functions in the Joomdle external service used in Moodle admin side. I can't access through the service call in Joomdle, it shows error. May I add core function in the auth file of Joomdle in Moodle server. Please suggest me the way.

I am sorry, but I don't think you can do that.
I would just use a new service in Moodle, and use different calls for them and Moodle.