OPAC Integration

Hi,
i came up with the idea of integrating my municipal librarys acount of books i grabed with due dates. By now i use the android app “web opac” (Web Opac App), which is open source.
I thought it would be an obvious usecase for many, to centralize things in HA (Wall dashboard) but I didnt get any hints on this topic by searching this forum.
So I wonder, if I missed something, and something (similar) is already exisiting?
Or if not, if you guys think it would be possible for me to write this integration on my own with little programming skills so far? How long would this process take? I cannot say if its a realistic task for me, because i dont even know what to expect. Is this a totaly naive idea?
Thanks a lot!