What kind of web tool/framework comes with ui designer for non-developers

I'm looking for toolset/framework for web application and I need help/advice from people more experienced in that field.

The use-case is monitoring/interacting with hardware devices. What probably is the biggest challenge is that simple webpages/panels are in large proportion designed by operators/scientists without software development experience. Currently we're working with Qt and QtDesigner which allows to define custom widgets and provide users possibility to create their own panels just by "drag-and-drop" + fill out 2/3 fields in a table. This is good enough for most cases where one needs to see couple of values and simple plots.

The are two (significant) things that are problematic with above approach. Only certain machines with all tools installed have the panels available - changing this to web based system would remove this constraint. Power users are quite crippled - panels are static as they are only .ui files loaded to a framework - meaning no more complex (and needed) functionality can be added.

Backend to handle the data needed for display is available in python/c++/command line tools.

Does anyone have experience with similar challenge? What kind of approach you used/drawbacks you see?