button – How to change the text of multiple buttons in Unity

I have 12 buttons and I want to fill them with numbers from 1 to 12. I would like to change the text with a script so that I do not fill it manually. I do not want to make the reference of the 12 buttons for a GameObject (public GameObject btn1 …) and they all fill one with btn1.GetComponent (). text. There must be a way to change the text of the buttons with just one for. I would be very happy about your help.
These are the buttons that I have