Call a rpg program from a node script running on an external windows or linux server

Hi everyone, I may soon find myself in the situation in question: a web app running on a Linux or Windows server needs to access data on the Power Server. Obviously, this involves structured information based on a well-defined and consolidated calculation in a business logic managed by three RPG programs that have been doing their job effectively for 20 years. The only change was made about twenty years ago, and a parameter was added to the programs that simply creates an PF-DTA object as an output file with this data to be later managed.
So, back to the point: what's the best way to allow a Node.js script running on a Linux (or Windows) server to connect with a specific user to a Power Server on IBM i 7.3 or 7.5 and make a call pgm1(parm1); wait a few milliseconds for the execution time and then retrieve a database file? Has anyone had similar experiences? Perhaps encapsulate the pgm in an SQL function?
Thanks in advance to anyone who can share their experiences.