Blazor Design: Expression Service That Depends on other Objects

var formula = "[value] + [value2]";

public List<Component> Components {get;set;}
...
public OnComponentInitializing(Component reference){
  Component.Add(reference);
}

public OnComponentDisposal(Component reference){
  Component.Remove(reference);
}
...

public double GetValue(string tag){
  //converts tag into a label
  //search list for a component that matches the label
  //if found returns the value
}