Can't use /tellraw as the completion message

Minecraft Version: 1.12.2
Mod Version: 0.9.5

I can't figure out how to use the /tellraw command in my research.

It's kind of annoying, as I don't want the @ sign that /say generates. Not a huge deal though.

Loving the mod btw, it's exactly what I was looking for.

Here's the script:

var stone = ResearchTable.addCategory(<minecraft:stone_pickaxe>);

ResearchTable.builder("stone_age", stone)
  .setIcons(<minecraft:stone_pickaxe>)
  .setTitle("Stone Age")
  .setDescription("Research how to use Stone Tools")
  .addCondition(<ore:cobblestone> * 16)
  .setRewardStages("stone_age")
  .setRewardCommands("/tellraw @p {"text":"You've figured out how to make basic stone tools", "color":"white"}")
  .setRewardItems(null)
  .setNoMaxCount()
  .build();

ZengineeringTeam / ResearchTable

Can't use /tellraw as the completion message #41