This brings back memories. In the beginning of my career (early 90's) i implemented an entire UI for a Personnel Information System in COBOL on a Mainframe (CDC Cyber 180/840A) using ANSI escape sequences.
Thanks, i learnt a lot from that experience (my first job, sole developer, figure out a solution and get things done etc.). It was on those old monochrome visual display terminals and instead of using system specific languages/toolkits i hit upon this solution and it worked out.
Please don't judge me :-)