What is the correct way to configure Yii2 to get a submodule relative URL?

Question

Yii

I use the modular structure of the application, allocating a separate module for each group of tasks with everything that follows in its filling. If there is a first-level module, everything is relatively simple, register it in the application config and you can use something like this anywhere: But as soon as the task of registering the module as a submodule with different configuration to get different data sets when using common methods, I get a problem with getting relative URLs for a submodule:
Url::to(['default/index']); // user/default/index

Url::to(['rules/default/index']); // admin/user/rules/default/index вместо admin/rules/default/index

Does anyone know how this can be cured?
The bottom line is that there is a widget that extends Selec2 and encapsulates setting up an ajax request to get records through a search. But if now it is connected as a submodule, the url breaks and does not understand where to go.