what should i put in "plugin_opts"?

[thomazleventhal]

What version of shadowsocks-libev are you using?

3.3.5

What operating system are you using?

ubuntu server

What did you do?

I'm trying to use a plugin with shadowsocks, but i don't understand what is the "plugin_opts"

What did you expect to see?

the plugin "cloak" working

What did you see instead?

the server crashes and the error "plugin service exit unexpectedly" appears

What is your config in detail (with all sensitive info masked)?

"server":"...",
"mode":"tcp_and_udp",
"server_port":443,
"local_port":1080,
"password":****,
"timeout":300,
"method":"aes-256-gcm",
"plugin":"/etc/cloak",
"plugin_opts": ???