Sorry i am a bit late to answer, i have also been looking for an office like app on UT,
Have you tried using an online tool such as etherpad?
There are several downsides of course but so far it is the best experience i have had.
There is a web app available in the openstore :
But for me i cant import or export files with it,
I sometimes use https://framapad.org/en which you can access via a webapp with webber, it lets you import and exports files to work on, the webpage is publicly available but you can select the duration before it expires.
You can also create an account to manage pads and access rights.