The full descriptive label in the explorer is hardcoded https://github.com/solana-labs/solana/blob/5450f978445cff9ac9959d47a7429e0b78c873e3/explorer/src/utils/tx.ts#L66

So there is no way to programmatically obtain this label, the only way would be to have a more descriptive name field embedded in the IDL

The full descriptive label in the explorer is hardcoded https://github.com/solana-labs/solana/blob/5450f978445cff9ac9959d47a7429e0b78c873e3/explorer/src/utils/tx.ts#L66

So there is no way to programmatically obtain this label, the only way would be to have a more descriptive name field embedded in the IDL.

The way you are converting the base64 program data into a buffer is correct const dataBuffer = Buffer.from(...info.data) However, you cannot really do anything from there because this info.data field is the binary of the program to be run by the solana runtime.