Get smart of disks connected with megaraid controller

[demokom-gmail-com]

Hi, guys, thanx for your great work.
Well, I tried to get smart of my disks connected with megaraid controller, but no luck.
I know to get smart info with smartctl in my case I need to add extra arg to this command - "-d megaraid,X".
I guess I can do it with this trick:

--smartctl-arg SMARTCTL_ARG
Pass an additional argument to the smartctl command.
Can be specified multiple times.

But app tells me something like this -
smart_exporter_helper: error: unrecognized arguments: --smartctl-arg=-d megaraid,8-11
no thoughts, can you help?