For a given IDL and account name, is there a lib (anchor or other) or function that finds for each account struct key, the offset where it begins?

So I'm having trouble finding the offset for some account keys of programs that have an IDL and would like to get some help on this. For example in this program

https://solscan.io/account/dRiftyHA39MWEi3m9aunc5MzRF1JYuBsbn6VPcn33UH#anchorProgramIDL

I would like for this account:

To know the offset where the key "unrealizedPnlMaxImbalance" begins.

Thank you in advance, for any help given