ISC DHCP - Option 82 filtering

Hello,
I need help with option 82 parsing in ISC DHCP. We pushed AVP "Framed-pool" from Radius server to BNG /DHCP relay. It successfuly adds this suboption to dhcp discover/request.
From BNG are DHCP requests relaying in this format:

DHCP options:

[82] Relay agent information: len = 45

[1] Circuit-id: ced-BNG|273|GRP-3921|pw-3921:0

[9] Vendor-Specific info: len = 11

Enterprise [6527] : len = 6

[13] dhcpPool: test

I need to use the suboption 13 (dhcpPool) for pool selection/static reservation. But all my attempts failed.
Do someone have experince with that? Thank you.