For posting image through an url, actually yes. there is a little workaround i’m using for Casper theme:
create HTML card in your post, add the image link to src
<figure class="kg-card kg-image-card kg-card-hascaption">
<img class="kg-image" src="https://image-link.com"
alt="example-image" />
<figcaption>
Some caption | <a href="">Source</a>
</figcaption>
</figure>
For pressing on the image, wrap the link around it:
<figure class="kg-card kg-image-card kg-card-hascaption">
<a href="https://image-link.com><img class="kg-image" src="https://image-link.com"
alt="example-image" /></a>
<figcaption>
Some caption | <a href="">Source</a>
</figcaption>
</figure>
make all of this into a Snippet to use many times again. I hope this helps!