The problem with import should be fix in the new 2024.01.0 version just released, where the s89 and ePUB import are working. (Please note the now there’s a problem with the ePUB watchtower as mentioned in the release notes.)
Concerning the “export data” TheocBase have the option to export some data as XML og iCal under settings. At the moment there’s not at “export to NWS” or other program.
I am a volunteer using some time with the TheoBase team and trying do give support to the best of my ability