Is it possible to enlarge images on iPadOS?

I am reading books on my mini iPad as a registered user via the Calibre content server. Whenever I come across an image with statistical graphics, I want to enlarge the image to see the details. But I do not know how to do it.

I tried

• one tap and holding,
• double taps and
• using two fingers (thumb and index finger) hold together and moving them outwards

None of these actions succeeded.
I am using iPadOS 15.7.3.