We are please to announce from build 2022.2 b21531 onwards you will be able to show banner within the project list page.
To add banner to your project list page, simply go to the folder on the file system and create banner.md file in the folder. The content of the file can be expressed as markdown which is a powerful easy to learn markup language. For more details on how to write in markdown click here.
A user can click "Do not show this again" and this will hide the banner permanently until the banner content changes.
NOTE: Banner's are folder specific and not inherited from parent folders unlike branding.