How can I add entity in JSON model use SAPUI5?

I have this JSON model:

1. {
2.     "employees": [
3.         {
4.             "mandt": 100,
5.             "pers_no": 1,
6.             "title_p": "Mr.",
7.             "firstname": "Fridolin",
8.             "lastname": "Bauqlec",
9.             "department": "Development",
10.             "function": "SAPcustomerDevelopment",
11.             "tel_numbr": "06205/29-0",
12.             "mob_numbr": "0152/121315",
13.             "e_mail": "f.bauqlec@bwzrtab.com"
14.         }
15. ]
16. }

I want create new entity in model use my SAPUI5 application.

Please help me with it.

Thanks.