I like to make these kinds of mock ups using https://asciiflow.com. Some of the components from the article paste nicely there.
Monodraw is a champ as well. Stand alone and outputs to graphic or text file. Easy to feed to other people or artificial people.
https://cascii.app many more features :)
Monodraw is a champ as well. Stand alone and outputs to graphic or text file. Easy to feed to other people or artificial people.