I am not aware of any nostr client that supports the nostr_image_host format. You can make a custom client that supports it or badger your favorite nostr client devs to support it.
The html for displaying an image uploaded via nostr_image_host looks like this:
<img class="nostr_image_host nostr_image_nimg12l24aeegn7qztt5we5t2ds9a4xtj0vd34jcrx4k6furj3yrueyshwumn8ghj7mn0wd68yat99e3k7mgjwy9wh"> <script src="https://supertestnet.github.io/nostr-image-host/nostr_image_host.js"></script> <script src="https://cdn.jsdelivr.net/gh/6502/sha256
This project isn’t receiving the attention it deserves. It’s truly impressive, works great, and definitely deserves more recognition, in my opinion. Nostr needs this, and we need it to be widely supported by other clients. Thank you for making this