The shown charting example of the OP is not that much related to FreeCAD. But the charting program Visio has in its professional version a 2D-drawing program for mechanics and is used for indoor room planning as well. Furthermore it has a module for piping and instrumentation diagrams usable for chemical engineering, which relates clearly to an engineering task. The same is true for the program Dia. A few years around 2000, SolidWorks included a Visio license just for this purpose.
Dia is not very comfortable for piping and instrumentation diagrams. Here is a lot of space for improvement.