How to add elements to the particular key in javascript?

“pfm_csp_56525_1_ck” :
{FLD_universityobject_Entry_Web_universityobject_DUMMY$$universityname_input : “none”}

“pfm_csp_56525_1_ck” :
{FLD_universityobject_Entry_Web_universityobject_DUMMY$$universityemail_input : “none”}

“pfm_csp_56525_1_ck” :
{FLD_universityobject_Entry_Web_universityobject_DUMMY$$address_input : “none”}

“pfm_csp_56525_2_ck” :
{FLD_universityobject_Entry_Web_universityobject_DUMMY$$location_input : “none”}

“pfm_csp_56525_2_ck” :
{FLD_universityobject_Entry_Web_universityobject_DUMMY$$status_input : “none”}

i need this elements to the particular group like (example) = >

public compositeSet = {
“pfm_csp_56525_1_ck” : {‘FLD_institute_d_w_entry_institute_dummy$$secretcode_input’:”none”, ‘FLD_institute_d_w_entry_institute_dummy$$addressline1_input’: “none” },
“pfm_csp_56525_2_ck”: {‘FLD_institute_d_w_entry_institute_dummy$$email_input’: “none”, ‘FLD_institute_d_w_entry_institute_dummy$$institutename_input’: “none” },
}