The part is called a Chin Plate Apple won’t replace this part, they will only replace the entire display assembly!
As long as the glass shards haven’t damaged the ribbon cables just behind you should be able to replace it and save your self $800 ~ $1,100 USD! Plus the labor if you let someone do it.
Here’s the needed part MacBook Pro 16" A2141 2019 2020 Screen Glass Bezel Logo Strip about $38 USD!
Now the very tricky part you’ll need to use a hair drier to warm up the strip to soften the adhesive and then carefully peel away the shards making sure not to let any fall inwards and don’t poke too deeply behind as the space is very limited!
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