Merging 2 websockets into a single one

[spyflox]

I currently have 2 services:

• 1 to manage my inputs (InputsStateService)
• 1 to manage my outputs (OutputsStateService)

I want to create a dashboard on the interface that gives me real-time status updates of my inputs and outputs.
Currently, I am using 2 websockets.

Since my outputs change almost simultaneously with my inputs, I would like to have a single websocket that "merges" the 2 JSON outputs from InputsStateService and OutputsStateService.
Ideally, I would like to remove the websockets from InputsStateService and OutputsStateService and have a third service called DeviceStateService that handles this websocket.
I need to keep StatefulService to handle everything else : MQTT management, read and update state etc.

My knowledge of C is limited.
How can I create a single instance of InputsState and OutputsState and use them in InputsStateService and DeviceState (or in OutputsStateService and DeviceState?