That's true, I keep forgetting about https://lfortran.org/ Unfortunately in my experience the people I know who almost exclusively code in fortran are not really interested in jupyter notebooks.
https://gitlab.com/lfortran/lfortran/-/issues/313
Current Fortran programmers might not always appreciate the interactive part, but I think they will also like LFortran as another independent compiler and for some of its features once it matures (such as C++ translation, fast compilation, good warnings, automatic wrappers to/from Python, etc.).