The reason it takes longer than usual is because you are doing a nested search - you should, as much as possible, prevent this.
As far as I’m concerned, it is impossible to manually input something there.
Quick question, is your data a static? Since you have
dropdown trim's value, I’m assuming you have an input as well for the
car-specification-id? If so, why not use it? If you don’t have an input, maybe you should use an option set instead.
And if you don’t want to use option set, you could reference
car-specification-id to a custom state. To set a value to the state and simply add a default value
There are a lot of nuances and ways to go about this as you’ve noticed.
Hope this helps,