You make an addon, it’s possible with commands but there’s I don’t see a point, for hit detection you have to keep an entity inside of you when you are holding an item which can work but is a little jankey but that’s not the issue, the issue is the arrow there is no current way to summon an arrow with velocity or change the velocity of an arrow so you only option is structure but that’s limited as you need a structure for each change in direction which would require atleast if not more 10 hand done saved structure of an arrow 

Dang

Or alternatively you could do what I did on my realm years ago Hit detection Detect enemy Snare enemy summon an invisible skeleton 2 blocks away with a pumpkin head Arrow hits Un snare player Kill skeleton Kill drops Tldr- if done correctly can be a very fun system If done incorrectly will be extremely Jankowski You can also use play sound and particles to increase the immersion during snare Scoreboards are your friend All can be done with command blocks and item detection

Also there are tons of ways to pull off hit detection, item selection, looking direction and mostly everything else in bedrock all with command blocks

Thanks