import tkinter as tk

root = tk.Tk()
root.title('Label Test')
root.geometry('250x150')

WIDGET_MAX = 3

labels = [
  tk.Label(
    root,
    text='テキスト1行目\n2行目',
    relief='solid'),
 
  tk.Label(
    root,
    text='テキスト1行目\n2行目',
    relief='solid',
    justify='left'),

  tk.Label(
    root,
    text='テキスト1行目\n2行目',
    relief='solid',
    justify='right')]

root.columnconfigure(0, weight=1)

for num in range(WIDGET_MAX):
  root.rowconfigure(num, weight=1)
  labels[num].grid(column=0, row=num)
    
root.mainloop()