request help: how can I wrap my response body

[wtjperi2003]

Issue description

for example: response from upstream service is: {"name":"abc","id":124}, then at the apisix. I want it to wrap it: {"success":true,data:{"name":"abc","id":124}}

Environment

• apisix version (cmd: apisix version):
• OS (cmd: uname -a):
• OpenResty / Nginx version (cmd: nginx -V or openresty -V):
• etcd version, if have (cmd: run curl http://127.0.0.1:9090/v1/server_info to get the info from server-info API):
• apisix-dashboard version, if have:
• the plugin runner version, if the issue is about a plugin runner (cmd: depended on the kind of runner):
• luarocks version, if the issue is about installation (cmd: luarocks --version):

[tzssangglass]

refer to: #4837 (comment)