As of now i know these are considered a modded item or can be used to input them inside the game itself by using commands on the PC edition of minecraft but now is the time to actually have these items added insude the console editions. Parkours are now decreasing in creativity ideas, there are really no sort of "parkour related items" and adding rope swings give us more of an idea of how to make a parkour better (i am not complaining about how parkours are being made, they are all amazing creations) as this is my very first forum post it will not let me undo the linking in text so I apologise. If you would like a better idea of how these would work or what they would look like, simoly search the text rope swing mod in your video engine search bar :3
Rope Swings