Best method I have found is to do a screen capture of the actual image using the macOS screen capture tool and save to clipboard. Then just paste that into the Macro Action Found/Find Image well.
I have tried to "capture" what I want to find on my Mac book pro with the screen capture. e.g. trying to capture the "Picture Format" on the ribbon. of Microsoft Word. CMD + SHIFT + 4. This is without the bar underneath so it will set picture format to on. then I can click on align etc. from the macro. If it is already on then the find fails that's ok because I have it set so failure doesn't abort macro and it just proceeds to format.
I use this a lot but can't seem to have this work reliably.
You don't state what your ultimate objective is, but, in general, use of KM Found Image should be a solution of last resort. Particularly when using MS Office apps, all of which have a very powerful and comprehensive VBA macro language.
It is easy to get started: Simply invoke the Word Macro Recorder, and go through the manual steps you want to automate. Then edit the Word Macro to cleanup and further refine.