Specify the image Google Search uses for your organization's logo in Search results and in the Knowledge Graph. Google Search uses the markup in the use case example to recognize the image to use as the organization’s logo. This ensures that, when possible, the image appears in search results about the company. Markup like this is a strong signal to Google Search algorithms to show this image in Knowledge Graph displays.
Here's an example of a logo in JSON-LD code.
Structured data type definitions
For logo usage, Google Search recognizes the following properties of an Organization. You must include the required properties for your content to be eligible for display as a rich result.
URL of a logo that is representative of the organization.
Additional image guidelines:
The URL of the website associated with the logo.