Assuming that I was right regarding that it's not possible to create filter for questions based on the question and answer content and considering that there isn't a specific tag for what I'm looking for, in this case, for asking for a site recommendation to ask questions about application software, the **workaround** is to set a broad filter, i.e., all questions from Meta Stack Exchange, then use client-side (email client, RSS client) filtering features.


Other workarounds imply using other tools like the Data Explorer, Stack Exchange API and saving a search as a bookmark. An "advanced" workaround could be to use third-party services like [Programmable Search Engine][1], formerly known as Custom Search Engine.


  [1]: https://programmablesearchengine.google.com/about/