There is no specific feature for General ledger or Cashbook, but you can show e export similar lists using Overview and Search.

Example: Show Cashbook for 2018

  1. Show Overview
  2. Choose 2018 from date on the top
  3. Tap Balance to show the list of 2018
  4. Search [Cash] from the Search on the top
  5. Export from the right upper button

*Please note that the seach includes words from summary and other account names.