Increasing the amount of trees

I am trying to increase the amount of trees generated on Version 1.20.1 I tried changing the count in "data\minecraft\worldgen\placed_feature\trees_taiga.json" but i am not seeing any difference ingame. "count": { "type": "minecraft:weighted_list", "distribution": [ { "data": 100, "weight": 9 }, { "data": 150, "weight": 1 } ] } I have increased the count by a lot so there should be at least some visible difference ingame. What am i missing / doing wrong ?