pf2e.fyi
From Pathfinder Howl of the Wild, which isn't enabled.

Stretching Reach

FEAT 5
Activity 1 action

You can leverage your size and muscle to extend your reach and attack more distant foes. While in this stance, when you wield a melee weapon that requires two hands and doesn't have reach, the weapon gains a reach of 10 feet.

Pathfinder Howl of the WildORC