How to create a transparent label inside a progress bar with custom tkinter

I'm trying to create a label inside a progress bar while still showing the progress widget underneath

here is my code:

import customtkinter as ctk

window = ctk.CTk()

prog_num = ctk.IntVar(value=100)
prog_str = ctk.StringVar(value='100/100')

prog_frm = ctk.CTkFrame(window)
prog_pbr = ctk.CTkProgressBar(prog_frm,
                              variable=prog_num,
                              height=15,
                              progress_color='#fa2844')

prog_lbl = ctk.CTkLabel(prog_pbr, textvariable=prog_str, fg_color='transparent')

prog_pbr.pack(fill='x')
prog_lbl.place(rely=0.5, relx=0, anchor='w')
prog_frm.pack(fill='x')

window.mainloop()

code output:

even thought he fg_color is set to transparent it still shows some sort of label background
The only solutions ive found only work for regular tkinter

If you study the code of customtkinter, you will find that CTkProgressBar is a Canvas widget inside a Frame widget. So you can draw the required transparent text inside the Canvas widget using Canvas.create_text().

Below is an example using a custom CTkProgressBar that show the progress text at the center of the bar:

import customtkinter as ctk

ctk.set_appearance_mode("dark")

class MyProgressBar(ctk.CTkProgressBar):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        # create the text item in the internal canvas
        self._canvas.create_text(0, 0, text=self._variable.get(), fill="yellow",
                                 font=('Arial', 10), anchor="c", tags="progress_text")

    # override function to move the progress text at the center of the internal canvas
    def _update_dimensions_event(self, event):
        super()._update_dimensions_event(event)
        self._canvas.coords("progress_text", event.width/2, event.height/2)

    # override function to update the progress text whenever new value is set
    def set(self, val, **kwargs):
        super().set(val, **kwargs)
        self._canvas.itemconfigure("progress_text", text=int(val*100))


window = ctk.CTk()

prog_frm = ctk.CTkFrame(window)

prog_num = ctk.IntVar(value=50)
# create the custom progress bar
prog_pbr = MyProgressBar(prog_frm,
                         variable=prog_num,
                         height=25,
                         progress_color='#fa2844')
prog_pbr.pack(fill='x', padx=50, pady=20)
prog_frm.pack(fill='x')

# loop to update the bar for demonstration
def update(val=0.0):
    prog_pbr.set(val)
    window.after(100, update, (val+0.01)%1)

update()

window.mainloop()

And the output: