Image size control in wiki

When I try to add an image to a GitLab wiki, it automatically is scaled to the width of the page.
I want to be able to control the size of the image.
When I google for this, closed issues like this show up, but not with a clear solution:

My current workaround is to composite the image onto a wide white background which is far from ideal. What am I missing?

If you are using Markdown syntax, does using HTML <img> tags to specify height and width attributes work?

Also, Dynamic Image resizing for avatars and content images (&3822) · Epics · · GitLab appears to still be under progress, but if you are on a very current version then you can try adding a query parameter to the end of the image URL to specify height and width, something like the following perhaps: