The taxation of crypto-assets is managed differently in each country. Cryptocurrency is still a new technology, and governments are assessing how to classify crypto-assets. We recommend you contact a licensed accountant or service provider that is qualified to advise you on cryptocurrency taxes in your specific country/region.
Though there isn't a way to directly export all transaction information from your Jaxx Liberty wallet, there are ways to get all your wallet information in bulk, provided the tool you're using to report your taxes supports wallet xPubs.
To located your crypto-asset specific xPub, go into the MENU > Tools > Private Keys >...>[asset]> and look for the xPub keys at the top. Use the Account xPub in the tool to get all your wallet activity for that specific digital asset. For Ethereum (and ERC20 tokens) and Ethereum Classic, use your Receive address; all your wallet transactions are present on that address.
For ZenLedger in particular, we have worked with them to develop this how-to article, which is featured on their help centre.