The CSV files exported by Enpass are not readable by KeePass because as there are different entry types in Enpass the different lines in the CSV have different information.
Therefore I created a very simple python script that takes a JSON export from Enpass as parameter and creates a file named keepass.csv containing the information from the JSON file. This CSV file can then be imported into KeePass.
To run the script, simpy pass the JSON file as parameter:
python3 enpassjson2keepasscsv.py enpass.json
This will read the enpass.json and create a new file named keepass.csv in the current directory.
I just tested the import with KeePassXC so I don't know if it works for other versions of KeePass as well.