execute as @e[shooter>] at @s run tp @s ~ ~ ~ facing entity @e[<selector for target>,limit=1]

execute as @e[<shooter>] at @s run summon arrow ^ ^ ^1 {NoGravity:1}
execute as @e[<shooter>] at @s positioned ^ ^ ^1 run scoreboard players set @e[type=arrow,distance=0] id 1
execute as @e[type=arrow] store result score @s x run data get entity @s Pos[0] 10
execute as @e[type=arrow] store result score @s y run data get entity @s Pos[1] 10
execute as @e[type=arrow] store result score @s z run data get entity @s Pos[2] 10
execute as @e[type=armor_stand] store result score @s x run data get entity @s Pos[0] 10
execute as @e[type=armor_stand] store result score @s y run data get entity @s Pos[1] 10
execute as @e[type=armor_stand] store result score @s z run data get entity @s Pos[2] 10
execute as @e[type=armor_stand] at @s positioned ^ ^ ^1 run scoreboard players operation @e[type=arrow,distance=0] x -= @s x
execute as @e[type=armor_stand] at @s positioned ^ ^ ^1 run scoreboard players operation @e[type=arrow,distance=0] y -= @s y
execute as @e[type=armor_stand] at @s positioned ^ ^ ^1 run scoreboard players operation @e[type=arrow,distance=0] z -= @s z
execute as @e[type=arrow] store result entity @s Motion[0] double 0.1 run scoreboard players get @s x
execute as @e[type=arrow] store result entity @s Motion[1] double 0.1 run scoreboard players get @s y
execute as @e[type=arrow] store result entity @s Motion[2] double 0.1 run scoreboard players get @s z