I’m trying to build a server extention to an on-premise Azure DevOps Server 2019.
I want azure devops server to act as a proxy do download an artifact from S3-storage.
All of that needs to happen inside the workitem control.

So far I was only able to add a custom button to trigger the download on a workitem form, but I can’t find any documentation if I can also extend the azure devops server side.
Any help or advice would be appreciated.