Why would you migrate a legacy system TO(!) Cobol?

What are reasons to migrate a 1M Lines of Code Legacy System to(!) Cobol? And how can we perform such a migration project cost-efficiently and minimize manual work? Together with our industrial research partner itestra GmbH, we shared some insights at ICSME! Check out the paper: www.doi.org/10.1109/ICSME52107.2021.00055