This is a great video which helped me on a way: https://www.youtube.com/watch?v=-1jsBllmr-w
However, in this video, it takes an image from OneDrive but I want to populate it from CDS image field.
- Add image control to a Word template. Watch the video I referred above showing how to add controls step by step then come back for the image adding part.

2. This is my image store in CDS:

3. And a CDS field set up.

4. And now Flow:


Here JobDescription and JobImage are fields of a Job entity.
5. A few actions outputs to see how the image is stored:


The format is: application/octet-stream.
According to docs(https://docs.microsoft.com/en-nz/connectors/wordonlinebusiness/#populate-a-microsoft-word-template):
Guide for using Images in the Word Online connector.
- Add an Image content controller in your template. Don’t delete the placeholder image. You can re-size and re-position it.
- Add a title property to the image content controller so that you can easily identify it in the Power Automate designer.
- When the image field shows up in the designer, add file contents of a JPG or PNG image as the value. The value should look like this: { “$content-type”: “image/png”, “$content”: “iVBORw0KG…i/DhQmCC” } where the content is the base64 encoded image.
6. That’s why we use Compose to construct the required JSON:

7. And the result in the generated document as expected:

Hope it helps!