syntax for geli with using device's label(glabel)

[Nick Ulen]

Greetings,
The problem is that I can't configure provider which must be attached on 
boot with using key and device's label.

glabel list da0s2
Geom name: da0s2
Providers:
1. Name: label/tank

I got "syntax error",when I used strings as below in loader.conf:

geli_label/tank_keyfile0_load="YES"
geli_label/tank_keyfile0_type="label/tank:geli_keyfile0"
geli_label/tank_keyfile0_name="/boot/keys/label_tank.key"

Which is correct syntax for loader.conf?

Regards.
Nick