A blender export plugin that exports a collection named Export with FBX_SCALE_UNITS

operator_whitebox_fbx_export.py

import bpy
#This blender plugin will export everything in a collection named Export with fbx format with FBX scale.
#You can adjust to your needs for options - usefull for making sure you have consistent
#export settings for your FBXs and an easy way to reach them. I suggest you add it to quick shortcuts as well.
#I just press q->export and enter and then I have exported a new version.

bl_info = {
    "name": "Export whitebox mesh",
    "blender": (2, 80, 0),
    "category": "Exporter",
}


# ExportHelper is a helper class, defines filename and
# invoke() function which calls the file selector.
from bpy_extras.io_utils import ExportHelper
from bpy.props import StringProperty, BoolProperty, EnumProperty
from bpy.types import Operator

#Recursivly transverse layer_collection for a particular name
def recurLayerCollection(layerColl, collName):
    found = None
    if (layerColl.name == collName):
        return layerColl
    for layer in layerColl.children:
        found = recurLayerCollection(layer, collName)
        if found:
            return found

class WhiteboxFbxExporter(Operator, ExportHelper):
    """This appears in the tooltip of the operator and in the generated docs"""
    bl_idname = "export_test.some_data"  # important since its how bpy.ops.import_test.some_data is constructed
    bl_label = "Whitebox fbx exporter"

    # ExportHelper mixin class uses this
    filename_ext = ".fbx"

    filter_glob: StringProperty(
        default="*.fbx",
        options={'HIDDEN'},
        maxlen=255,  # Max internal buffer length, longer would be clamped.
    )

    # List of operator properties, the attributes will be assigned
    # to the class instance from the operator settings before calling.
    use_setting: BoolProperty(
        name="Are you cool",
        description="That is good",
        default=True,
    )

    type: EnumProperty(
        name="Checkboxes",
        description="Choose between two items",
        items=(
            ('OPT_A', "Pizza", "Does not do anything atm"),
            ('OPT_B', "Lutefisk", "You must eat lutefisk forever"),
        ),
        default='OPT_A',
    )
    
    

    
    
    

    def execute(self, context):
        collectionHolder = bpy.context.view_layer.active_layer_collection;
        lookingForCollection = "Export"
        layerCollection = bpy.context.view_layer.layer_collection
        bpy.context.view_layer.active_layer_collection = recurLayerCollection(layerCollection,lookingForCollection)
        print (bpy.context.view_layer.active_layer_collection.name)
        val = bpy.ops.export_scene.fbx(filepath = self.filepath,use_active_collection=True,apply_scale_options='FBX_SCALE_UNITS')
        bpy.context.view_layer.active_layer_collection = collectionHolder
        return val 




# Only needed if you want to add into a dynamic menu
def menu_func_export(self, context):
    self.layout.operator(WhiteboxFbxExporter.bl_idname, text="Whitebox fbx exporter")


def register():
    bpy.utils.register_class(WhiteboxFbxExporter)
    bpy.types.TOPBAR_MT_file_export.append(menu_func_export)


def unregister():
    bpy.utils.unregister_class(WhiteboxFbxExporter)
    bpy.types.TOPBAR_MT_file_export.remove(menu_func_export)


if __name__ == "__main__":
    register()

    # test call
    bpy.ops.export_test.some_data('INVOKE_DEFAULT')