Giving a label a border in custom tkinter

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I am using CUSTOM tkinter ( for a project I am working on in Python. I would like to make a border around the labels I am using for the camera. Currently, here is the code for my label.

main_frame = customtkinter.CTkFrame(root, height=400, width=1000)
main_frame.grid(row=1, column=0, padx=10, pady=5, sticky='EW')

left_cap_label = customtkinter.CTkLabel(master=main_frame, text="left_cap_label"), rely=.5, anchor="center")

right_cap_label = customtkinter.CTkLabel(master=main_frame, text="right_cap_label"), rely=.5, anchor="center")

I would like to make the left_cap_label and right_cap_label have borders around them, preferable in white. Is there anyway to do this? I know in regular tkinter you can use borderwith, but I am not sure if there is a alternative in custom tkinter. Thank you!

Looked onto the documentation for a border argument under the CtkLabel, but could not find any.