Customize Eventhandler in XCode - iOS Code compiled by Unity

Hello,

before asking my question I'd like to explain my workflow right now. I'm working on a augmented reality App at the moment. A part of that is the vuforia Object recognition, which is used in Unity. Status quo is, I am able to distinguish between different Objects and display Object-related Information including Database information.
This works all like I imagined, all simply compiled by unity and tested on an iOS device.

Now: I have to include another service, which displays live dashboards (charts, bars and so on) connected with my database. That live dashboard is on a website. I am able to display a UIWebview in Xcode and the website itself. But how can I attach that now to my eventhandler? In my unity project there will be a Diagramm-Button, if that is clicked, the window (programmed in swift/Xcode) shall be opened. So it is kind of interacting crossplatform. E.g. Click on But X with Unity Compiled stuff -> open Live Dashboard X with Code written in Swift oder c#.

Is that even possible?
Maybe something like on an event, transfer are Value of a variable to a variable which can be read in native Swift/ C#

I tried to find that lines of code in the compiled code, but I dont get that code at all.

Thanks heaps!