What online programs are there for compiling text from pre-prepared "blocks"?

Question

Text Processing Automation

My friend works in a children's speech therapy center and every day she writes a lot of conclusions based on the results of examining clients. Most of the conclusions are typical and consist of several easily formalized blocks: the result of the inspection, recommendations, forecasts, etc.
Is there any service that allows you to create several ready-made text blocks and then use the mouse to collect the final conclusions from them?
I found a similar product flashpaste.com/rus , but it is offline and under Windows. Interested in a cloud solution with the maximum number of features (inserting variables into templates, nesting templates, breaking templates into categories, etc.).
It seems that I once saw something similar (the service was for drawing up contracts from the so-called "building blocks"), but I can't find it now.