This is SO COOL!!!

KICK THAT DOOR SO MUCH!!! MY FOOT HURTS... 

AWESOME!!!

OKAY... so what i did was 

delete the default cube,light & camera...

then instead of importing .fbx from blender

i pressed "N" and open the ggt panel in the right side...

then  under Character utilities > armature 

I initialize the T-pose .fbx file 

then join animation this time don't select the T-pose just the rest of all your animation.

then export from the ggt export character.

hope this helps.

(i was too confused in the beginning but after multiple tries this helped)

thanks ... i used blender 2.9 and it worked!!! perfectly (texture did'nt showed up in blender but it showed up in godot with all animation i wanted... )