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
- 1.968562.633+23
- 2.555227.710+11
- 3.29446.865-1
- 4.275110.714+13
- 5.259143.644+3
- 6.250150.625+11
- 7.22491.711+11
- 8.19265.747+5
- 9.672425.613+1
- 10.5611.836+3