Get stats from mangle rule with id of the mangle

RouterOS Scripting
1

I would like to check the stats value (packets or byte) of a special mangle rule identified by its id or comment.
The parameters will then be compared with 0 in a script.

I was woundering something like

:set packet [/ip firewall mangle get $j packets ]

But it seems not so easy.
Thanks for your help.

2 
[admin@router] /ip firewall mangle> pri where action="change-ttl"
Flags: X - disabled, I - invalid, D - dynamic
 0   chain=postrouting action=change-ttl new-ttl=set:1 out-interface=Vlan4

[admin@router] /ip firewall mangle> set 0 comment="testComment"

[admin@router] /ip firewall mangle> pri stats where comment="testComment"
Flags: X - disabled, I - invalid, D - dynamic
 #   CHAIN               ACTION        BYTES       PACKETS
 0   ;;; testComment
     postrouting         change-ttl    139009918   117290

[admin@router] /ip firewall mangle> :local test [/ip firewall mangle { get [find comment="testComment"] bytes }]; :put $test;
139009918

[admin@router] /ip firewall mangle>
3

Works fine.
Thanks

4

Amazing, but is there a way to get RATE intead bytes ??