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Goto is control flow. You can’t do control flow with function calls in the sorts of languages we’re talking about, so goto has to be built into the language, typically as a statement.
(In some of these languages you can do awful hacks like using hooks intended for debuggers <https://entrian.com/goto/> or rewriting bytecode <https://github.com/snoack/python-goto>, and frankly what Svelte does is quite similar, just implemented as a compilation step rather than at runtime.)
Perhaps this falls into the repetitive boilerplate category you referred to, but if you want framework-agnostic domain objects that still work well with Svelte, create your own using the observer pattern.
Create an object with a subscribe method and whatever other methods make sense for updating its state. Svelte will treat it like one of its stores, and it will work with the $ syntax. It can be used with React via its `useSyncExternalStore` hook. It can be used with SolidJS via its `from` utility.
If you don't want to handle the set-up boilerplate, you could use another library like Effector or RxJS, but of course, that means another dependency. There is a gradual move to make something like this a part of the platform[1], but who knows when or if it will land.
[1] https://github.com/domfarolino/observable