Is it possible to change TTL values on outgoing traffic on LR54?

I cannot seem to successfully add TTL commands to the firewall’s mangle table. For example:

digi.router> $ mangle -A POSTROUTING -o cellular1-sim1 -j TTL --ttl-set 117

firewall: No chain/target/match by that name.

I’ve also tried

digi.router> $ mangle -A POSTROUTING -o cellular1-sim1 -j TTL --ttl-inc 1

firewall: No chain/target/match by that name.

I’m running the latest version of xOS on an LR54. Any ideas on how to accomplish resetting or incrementing TTL?