Unfortunately, Azure Devops does not have the same capability (Confluence: Children Display).
The Table of Contents(TOC) markdown is used on the wiki page in Azure Devops.
here is where you may describe the image
This feature works in the same way as Children Display, but it can only connect to its own kid sites.
It has limits and is unable to link to subpages other than its own.
You must use link markdown to connect to other subpages.
However, it is not possible to provide a table of contents for the subpages.
As a result, the features in the Azure Devops wiki won't be able to suit your needs for the time being.