Volume issue importing from Blender to Unreal Engine

First of all, I don't know if this problem has anything to do with the plugin, and I'm not sure if this is the right place to write about this problem, but I wanted to write about it in case anyone knows the solution to this problem.
I apologize if this is not the right place.

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1: I get the characters from Daz Studio with the Diffeomorphic plugin.
2: I import them into Blender with morphs, MHX armature and extra stuff.
3: Finally, I want to import it into Unreal Engine and make a real-time game (I only have problems with this part)

(The Add-on I used to transfer from Blender to Unreal)

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(I also tried the DazToUnreal plugin, but the same problem persists. I also don't want to use that plugin, because I want to customize the characters the way I want in Blender and import them to Unreal that way)

My problem is that when I animate in Blender, I don't have any problem, but whenever I import this animation to Unreal, I have a volume problem.
In Blender, checking the "Preserve Volume" checkbox in the parameters of the Armature Modifier completely solves this problem, but I couldn't find such a feature in Unreal (I searched)

Does anyone have an answer on this? How can I solve this problem completely?
I could solve it with Shape Keys, but that would be incredibly tedious (creating Shape Keys for each animation is like digging in the dirt with a fork)

Can anyone help me if they have encountered this problem before and know the solution?

(As I said above, I'm not sure if this is the right place for this problem, don't get mad at me if it's not. I really couldn't find a solution and wanted to ask you guys).

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This is how the character looks in the 'Unreal Engine' engine (the problem is the bulge in the middle)

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This is the view of the same pose in 'Blender' (I want to get the result in Unreal Engine engine, like the one on the left, without protrusion).

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