With the Asset Editor you can publish swatches (for example, a swatch for a blinn shading node) by publishing the node’s associated message attribute. Swatches provide you with visual feedback on shading node properties.
To publish a swatch
Since the Message attribute will publish with the default name Message, it is best that you publish this attribute with a more meaningful, custom name. This is especially important when an asset contains multiple published swatches for multiple shading nodes.
Open the asset in the Attribute Editor to see that the swatch now appears in the Published Attributes section. Modify attributes related to the shader to update the swatch accordingly.