You can make it yourself.
/fill 0 0 0 15 127 15 minecraft:tnt
/fill 0 128 0 15 255 15 minecraft:tnt
for instance, you need to divide it because the fill command won't handle more than 32,768 blocks at once.
Here's what it looked like after it exploded.
I didn't actually make sure it was a chunk, I just took 16X255X16 blocks (I forgot to replace the bottom layer of bedrock).
https://drive.google.com/drive/folders/1tQMf2r1wH6YrluS1o0HZdpDdBMUrADly?usp=sharing
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