Welcome to the forums @Kozaluss!
Currently there is no way to show the Bone2D display/gizmos in an exported game. The code is written to only show the bones in the editor.
You can add code to draw the bones though in the _draw function if you want to avoid having to add sprites to each node manually. You just need to have a script that extends Bone2D, add tool to the script so it runs in the editor, add the code in _draw, and then set the script for all the bones.
