This custom extension adds a markdown preview in SAP Web IDE (cloud edition – personal does not have support for custom extensions).
When a .md file is active, then a preview icon is available in the right pane:
The preview is opened in a new tab/window; Github styling and flavour is used.
Add a new destination in your Cloud Platform Cockpit.
Go to Extensions in SAP Web IDE (refresh if already opened) – the extension should be available (wait some minutes if not and refresh).
Project on GitHub: https://github.com/wozjac/sap-web-ide-markdown