BEAM Wallet: support for importing (and understanding) transaction history CSV files

I would like the ability to import transaction history from a BEAM wallet export.

Additionally, if we traded another currency, such as ETH, for BEAM at some point, it would be beneficial to be able to mark that transaction as a trade of the ETH → BEAM, just so it’s treated properly for tax purposes.

I could do a custom import, but that would obviously not track the current value of the currency as it changes.