I have only tested it on linux but it should work on windows+macos too.
- Make sure python 3 is installed
- Export the data from dashlane by visiting the web app, then pressing "My account" > "Settings" > "Export Data"
- Unzip the .zip-file downloaded from dashlane
- Download this script and put it in the same folder as the unzipped dashlane files
- Open a terminal in the folder where the csv-file is located