JQ Loop over Bash array add elements - json

Question

I do not seem to be able to find an answer, but have seen enough to know there is likely a better way of doing what I want to do.
Problem: I have a bash array. For each element in the bash array, I want to update a JSON array.
The JSON looks like the below. I am wanting to update the fruit array.
"foods": {
"perishable": {
"fruit": []
I'll get an array of length n, for example:
fruit_array=("banana" "orange")
It should look something like this:
"foods": {
"perishable": {
"fruit": [
{
"001": {
"002": "banana"
}
},
{
"001": {
"002": "orange"
}
}
]
Is there a nice way of doing this? At the moment I am trying the below:
#!/bin/bash
fruit_array=("banana" "orange")
for fruit in "${fruit_array[#]}"; do
jq \
--arg fruit $fruit \
'.foods.perishables.fruit += [{"001": {"002": $fruit}}]' \
template.json > template_with_fruit.json
done
This doesn't work for the obvious reason that the template is being re-read, but I have messed around to get it consuming the output of the previous iteration and nothing comes out at the end. I am only able to update the template once.
However, I know this seems a little dodgy and suspect there is a cleaner, more jq way.
A previous - aborted - attempt went something like this:
jq \
--argjson fruit "$(printf '{"001": {"002": "%s"}}\n' \"${fruit_array[#]}\" | jq -nR '[inputs]')" \
'.foods.perishables.fruit += $fruit' \
Which produced a escaped string which I couldn't do anything with, but at least hinted that there might be a neater solution to the standard bash loop.
I am missing something.
Any help would, as always, be appreciated.

Answer 1

JQ can do all that on its own; you don't need a loop or anything.
jq '.foods.perishable.fruit += (
$ARGS.positional
| map({"001": {"002": .}})
)' template.json --args "${fruit_array[#]}" >template_with_fruit.json

Answer 2

If you pass your array as a space delimited string, you can use JQ like so:
jq --arg fruits "$fruit_array" \
'.foods.perishable.fruit |= ($fruits | split(" ") | map({ "001": { "002": . } }))' input
{
"foods": {
"perishable": {
"fruit": [
{
"001": {
"002": "banana"
}
},
{
"001": {
"002": "orange"
}
}
]
}
}
}

Answer 3

Create whole json string at once with printf:
fruit_array=("banana" "orange")
printf -v fruits '{"001": {"002": %s}},' "${fruit_array[#]}"
$ echo $fruits
{"001": {"002": banana}},{"001": {"002": orange}},
Then add it to your template removing last comma:
$ echo ${fruits%,}
{"001": {"002": banana}},{"001": {"002": orange}}
"Numbers" could also be set like this:
fruit_array=("1 2 banana" "3 4 orange")
printf '{"%.3d": {"%.3d": %s}},' ${fruit_array[#]}
{"001": {"002": banana}},{"003": {"004": orange}},