Make multiple images in grid canvas expand with window

Question

I am trying to plot 2 images next to each other using Tkinter. I want to use Grid since I will position 10 images in a grid-like position.

In pack I can do it this way, what is the equivalent of that in the grid?

frame1.pack(fill=BOTH, expand=YES)

Here is my code

from tkinter import ttk, Canvas, BOTH, YES
import tkinter as tk
from PIL import Image, ImageTk

root = tk.Tk()
root.title("Widget Examples")

# Frame 1
frame1 = Canvas(root)
frame1.grid(row=0, column=0)
pilImage1 = Image.open("testImage.jpg")
image1 = ImageTk.PhotoImage(pilImage1)
frame1.create_image(0, 0, image=image1, anchor="nw")


# Frame 2
frame2 = Canvas(root)
frame2.grid(row=0, column=1)
pilImage2 = Image.open("testImage.jpg")
image2 = ImageTk.PhotoImage(pilImage2)
frame2.create_image(0, 0, image=image2, anchor="nw")
# Keep unchanged
root.mainloop()