fun <T> StateFlow<T>.collectAsState2(scope: CoroutineScope): State<T> {
    val state = mutableStateOf(value)
    scope.launch {
        collect { state.value = it }
    }
    return state
}

interface IStateHolder {
    val uiState: UiState
}

class State(dataSource1: DataSource1, dataSource2: DataSource2, scope: CoroutineScope) : IStateHolder {
    private val dataSource1State = dataSource1.data1Flow.collectAsState2(scope)
    private val dataSource2State = dataSource2.data2Flow.collectAsState2(scope)

    override val uiState = derivedStateOf {
        if (dataSource1State.value == ...) {
            // Construct an UiState here based on complex logic
        }
    }

    companion object {
        @Composable
        fun rememberState(dataSource1: DataSource1, dataSource2: DataSource2): IStateHolder {
            val scope = rememberCoroutineScope()
            return remember { State(scope) }
        }
    }
}

State

rememberState()