Change the TNT-Explode delay with a command

Hello,

I want to create a mod where the player can change the delay between activation and exploding of TNT (vanilla = 80 ticks / 4 seconds). Preferably it should be possible to edit this with a command. I've been trying to create it with procedures, but have no idea, how.

Has anyone an idea how I can do that?

Thanks a lot and best regards,
PMulberry