You can build a small Qlik Sense Extension. From an extension you could do POST commands or any other things that a modern Web API would use.
You can find documentation here:
Although the documentation emphasize the word "Visualization" all the time your extension needs not necessarily have more than a minimal visual part. So even a button, or a status text or a link could be a "visualization" in this sense. You would need some kind of interaction (submit) facility in Qlik Sense anyway to trigger the POST.
Another approach could be indirectly via the Advanced Analytics Integration (AAI). Here interactions with a back-end is automatically triggered through normal recalculations in Qlik. You can then use many different languages to perform the communication with you workflow software:
Although Qlik marketing prefers to brand this as Advanced Analytics the underlying mechanism they are using is called Server Side Extensions (SSE) which can employ any kind of remote server (foreign to Qlik) via Google RPC.
This is an open source project BTW.