Originally Posted by _Vic_
I just wonder how you can make rules like bonus action, ready action, reactions, etc in an RTwP game

Why is this repeated over and over like it's a mystery of the universe?
If the game wants a reaction from the player, the game will just pause and prompt the player for actions. This has existed for decades.
Want to ready your weapon? Just click the weapon icon.
Want to ready your shield? Just click the shield icon.
Want to jump on top of that wall? Just use that toggleable section of the wall which developers have prepared for you, the game makes an acrobatics check or dexterity check and the character is up on that wall.

There is no super mystery about any of this.