unpacking? yield? idk. something.

forin.sh

#!/bin/bash
# shellcheck disable=SC2034
# shellcheck disable=SC2154
# Yeah, I don't think I can make it shellcheck safe

forin() {
    local -n ref=$1
    shift

    while (($#)); do
        printf -v "$1" "%s" "${ref[__forin_pos]}"
        ((__forin_pos++))
        shift
    done
    if ((__forin_pos > ${#ref[@]})); then
        unset __forin_pos
        return 1
    fi
    return 0
}

haxx=(
    foo 12
    "bar bar bar" 47
    baz 91
    grault 0
)

while forin haxx who amount; do
    echo "$who has $amount of something"
done

echo
while forin haxx who amount friend famount; do
    echo "$who and $friend has $((amount+famount)) together"
done

out.txt

foo has 12 of something
bar bar bar has 47 of something
baz has 91 of something
grault has 0 of something

foo and bar bar bar has 59 together
baz and grault has 91 together

yes, it's zsh envy.

knirch@falschgeld ~ % echo $0
zsh
knirch@falschgeld ~ % hax=(foo 1 bar 2 baz 3)
knirch@falschgeld ~ % for a b in ${hax[@]}; do echo $b $a; done
1 foo
2 bar
3 baz

or, just use the tools available

hax=(foo 1 bar 2 baz 3)
set -- "${hax[@]}"
while (($#)); do
	echo "$2 $1"
	shift 2
done