Zabbix 4.4 [API] Usergroup.update additional permissions

[WytheNet]

Hi everyone!
I want additional permissions（such B） to group,but i don't know what are the original permissions（such A） of this group,I hope the permissions after the update are ( A + B),but if I use Usergroup.update, the permissions become A ,it lost B ,Who can help me ,thanks very much !

	Group	permissions
now	G	A
i wash	G	A+B

how can I get the permissions A ?

body:
{
  "jsonrpc": "2.0",
  "method": "usergroup.update",
  "params": {
        "usrgrpid": "29",
        "rights": {
               "id": "470",
               "permission": "3"
         }
   },
   "auth": "2eba49ad11332c6706eb4e1ae7a0d982", "id": 1}

[WytheNet]

it is resloved！ I found I can use "selectRights",it such as :

{
"jsonrpc": "2.0",
"method": "usergroup.get",
"params": {
  "output": "extend",
 "search": {
    search_type: search_name
  },
"selectRights":[
  "permission", "id" ],
"excludeSearch": exsearch,
"searchWildcardsEnabled": "true" },
"id": 11,
"auth": token }