How to send messages to the publisher with a Tridion Docs publish post-processing plugin?

Question

[background info] 
 Our company is using SDL Tridion Docs version 13.0.4630.2 I'm currently working on a post-process publishing plugin that analyses the temp files during the publishing process. 
 [goal] I hope to send custom messages (via message box) to users who triggered the publish process. At present I can only write custom message to backend's BackgroundTask_Execution_20240305.log. 
 [steps I've tried] I tried using Windows.Form in plugin's source code, but no winForm was poped up since the background application is not in userinteractive mode. I tried raising custom Exception, but no error message box was poped up as I had imagined. Only to found that publishing indicated as "Failed". 
 Is there any ways to produce a pop-up window during post-publishing process? 
 similar problem: community.rws.com/.../how-can-we-provide-user-friendly-feedback-on-a-failed-publish-event-in-tridion-docs

Gregory Kalten · Accepted Answer

Direct user interaction is not possible with a background task (publishing is a background task) during execution since they are executed asynchronously on a batch server as a windows service. In our implementation we send the user an email that details the problem. Other interactions are possible, basically anything the has an API/SDK method for generating a message would be possible as a post publish plugin step.

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How to send messages to the publisher with a Tridion Docs publish post-processing plugin?

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