@Kashish Goyal, Thanks for posting in Q&A. After researching, I find some links describe the script to enable BitLocker and set PIN. You can read them as a reference:
https://techexpert.tips/powershell/powershell-encrypt-disk-bitlocker-tpm-pin/
https://katystech.blog/mem/bitlocker-with-pin
Note: Non-Microsoft link, just for the reference.
Hope the above information can help.
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