How to import an other game datatable *.uasset file to UE4.27.2 for packing mod?

Development Platform & Builds
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I want to pack a game mod. This game was built by UE4.27.2, and it adopted IOstore, so there are *.pak, *.ucas, *.utoc
My Steps

  1. I installed offical Unreal Engine 4.27.2, and build new project.
  2. I modified DT_AllFlagSetupTable.uasset which is under Content\Main\Flag\Data. This file was exported by Fmodel.
  3. I copy game’s main folder to my project/content.
  4. Edit Top → Editor Preferences → Experimental Phase → Allow chunk ID assignment
  5. Edit top → Project Preferences → Project → Packaging → Use pak files/Use IoStore/Generate chunks
  6. Usin UE4.27.2 to packing mod, then it failed with “Error: Package …/…/…/…/Game/my project/Content/Main/Flag/Data/DT_AllFlagSetupTable.uasset has malformed tag”

I think my UE4 project don’t recognize DT_AllFlagSetupTable.uasset, so the packing failed.
How to import an other game datatable *.uasset file to my UE4.27.2 project? Thanks!