How can I get the info message from a blender operator?

I have make an operator which is doing multiple actions. One of them is the bpy.ops.mesh.remove_doubles(). My problem is that I can’t find a way to get it’s message info. For example, if I use bpy.ops.mesh.remove_doubles() individually, when it finish I get an info message of how many vertices have been removed. How can I get this info message through my operator?

class FU3DM_OT_clear_imported_meshes(bpy.types.Operator):
    bl_idname = "fu3dm.clear_imported_meshes"
    bl_label = ""
    bl_description = "Clear Imported Meshes"

    def execute(self, context):
        bpy.ops.mesh.tris_convert_to_quads(face_threshold=3.14159, shape_threshold=3.14159)
        return {"FINISHED"}

Most common technique is to flip editor type and copy contents.

import bpy

def get_report():
    # store it
    thiscontext = bpy.context.area.type
    # copy content
    bpy.context.area.type = 'INFO''SELECT')'DESELECT')
    # restore
    bpy.context.area.type = thiscontext
    # transfer to clipboard
    clipboard = bpy.context.window_manager.clipboard
    clipboard = clipboard.splitlines()[-1]
    # show

On the other hand there can be a way to access called operators from this list. But actually I don’t know how to retrieve the reports (if actually are stored in there).

>>> bpy.context.window_manager.operators[-1].name
'Merge by Distance'

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