Is there any way to register an `NLParameter`

as part of a `Model`

? For example, I would like to create a model

```
model = Model(Ipopt.Optimizer)
@variable(model, x)
@NLParameter(model, p == 0)
@NLobjective(model, Min, (x + p)^2)
```

and then access `model[:p]`

so that I can update the value with `set_value(model[:p], 1)`

. I’d like to do this so that if I have multiple `model`

s, then I can just update all the parameters like

```
for m in models
set_value(m[:p], 1)
end
```