Create a dummy ability that only the A.I can view and use, give it the same range as your attack (presumably very short melee range) and pending_ability_out_of_range_behaviour to chase.
Create a new ai_ability file for that ability, in the tactic_max_range_override set it to whatever aggro range you want. Don't forget to set the priorities, and maybe target filters.
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#Steam AliasWL%Streak
- 1.693240.743+13
- 2.43664.872+5
- 3.15651.754+8
- 4.314119.725+10
- 5.380114.769+2
- 6.310173.642+5
- 7.289131.688+5
- 8.675103.868+1
- 9.279149.652+2
- 10.589.866-1