How to make preloaders for images with unknown sizes?

Question

React

There is an image gallery in which the size of the images changes dynamically, depending on the width of the screen.
Both the size of the images themselves (width, height) and the number of columns (from 1 to 5)

change. Five columns:

Four columns:

Two columns:


Question: how to install a preloader for each image that would adjust to the size of each image?