Best Way to Do Capital Gains Entries On Crypto Swaps

[CD]

Currently I have a transaction that looks like the transaction below

2024-11-28 ! "XYZ Exchange" "Exchange 2.3300947 XXX for 1.62965293 YYY"

    Assets:Crypto:PrivateWallets:EXCHANGE:XXX         -2.3300947 XXX {} @70.43 USD

  Assets:Crypto:PrivateWallets:EXCHANGE:YYY          1.62965293 YYY {100.701546 USD, "Swap XXX for YYY on EXCHANGE 2024-11-28"}

  Income:CapitalGains

Is this the best way to set up an exchange like this?

In this example there are two lots the XXX are taken from - the first lot size is 2.0851416 XXX and has a &66.21451 basis and the other has a size of 0.2449531 XXX and has a 55.94963 basis

The capital gains on this transaction equals 12.34 USD

Essentially I use a script to calculate the basis of the coin being bought based on the price of the coin I'm using the pay for it. So the $100.701546 price of YYY is based on the price of XXX at purchase.  Then Beancount figures out the basis and subtracts that from the price I paid for the new coin to get the Capital Gains.

I want to make sure this is a proper way to do this or is there a better way?

Also,  since many of the transactions break down into multiple lots, how do you go about getting a report for something like an IRS form 8949?  What query would get the transactions for a time period but also give the individual basis amounts?  I'm assuming a script would then need to be used to get the data in the correct format, but can the base data be brought up relatively easy?

-Chris