How to make Fn activation in Mac os?

Question

macOS

Good day.
Tell me if it is possible in Mac OS Sierra 10.12.3 to activate Fn keys through Caps Lock. Periodically I work in a certain software that needs function keys. I would like to launch such software once to press Caps Lock and thus activate the standard function keys (f1-f12). The next press will return everything back.
Or, as in the new mbp with a touchbar, there is a setting for each application, you can configure the keys on the touchbar (including putting them permanently functional).

Answer 1

Why not just put the activation of f1-f12 as on stationary (without fn), and change the volume, screen brightness, etc. activate with fn key only?
In the keyboard settings, check the box: "Use F1, F2, etc. as standard function keys"