Converting values from bash for loop to json object

Below is a snippet of a for loop where I sort txt file names. I am then trying to save the results in a json format file. However it results in an json format that is not the desired. How could i convert to desired json format the values from the for loop?

dir="myfiles/test/"

prefix=""
echo "[" >> test.json
for dir in "${array[@]}"; do
        #reverse the result of comparisons
        file=$(find "$dir" -maxdepth 1 -type f -iname '*.txt' | awk "NR==$i")
        [[ -n $file ]] && 
                printf '%b{ "filepath": "%s" }' $prefix "$file" >> test.json
        prefix=",n"
done
echo
echo "]" >> test.json

Current output

[
    { "filepath" : "myfiles/test/sdfsd.txt" },
    { "filepath" : "myfiles/test/piids.txt" },
    { "filepath" : "myfiles/test/saaad.txt" },
    { "filepath" : "myfiles/test/smmnu.txt" },
]

Desired output

[
    [
        { "filepath" : "myfiles/test/sdfsd.txt" }
    ],
    [
        { "filepath" : "myfiles/test/piids.txt" }
    ],
    [
        { "filepath" : "myfiles/test/saaad.txt" }
    ],
    [
        { "filepath" : "myfiles/test/smmnu.txt" }
    ]
]

Also allow

[
    [
        { "filepath" : "myfiles/test/sdfsd.txt" },
        { "filepath" : "myfiles/test/sdfsd2.txt" }
    ],
    [
        { "filepath" : "myfiles/test/piids.txt" },
        { "filepath" : "myfiles/test/piids2.txt" }
    ],
    [
        { "filepath" : "myfiles/test/saaad.txt" }
    ],
    [
        { "filepath" : "myfiles/test/smmnu.txt" }
    ]
]


Source: unix

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