Remote access to Ionic app over network incl. Database

Hi there.
I have the following challenge.

The situation:
On a tablet runs an ionic app statically served from /www directory with a node express server

There should be the possibility that another client in the same network could access the same codebase (which already works. Access over
But it also should have remote access to the same persisted data (actually localStorage) from the other client in the network.
I have no clue to get this to work.

Another database solution?

Any advices for a solution are very much appreciated.
Thanks in advance