You can get started with an example config file, created by incrediblestrandofhair. For 1.12.2, put this in your profile's config folder. For 1.14.4, put this in the serverconfig folder of any worlds where you want these settings, and this in the mod archive's data folder.
A utility mod which, via a json file interface, allows customisation of the behaviour of any block when smashed (here defined as collided with at speed).
A utility mod which, via a json file interface, allows customisation of the behaviour of any block when smashed (here defined as collided with at speed).