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Using data binding: One way to populate the spinner's values with dynamic data is to bind it to a data source. You could create a list of elements, loop through them and add them to a dictionary or list then bind the spinner's 'values' property to the dictionary or list. The spinner will then automatically update whenever the source data changes.

Using a method: You can create a Python method that generates the list of items to be added to the spinner. Then, you can bind this method to the spinner's 'values' property using a lambda or a partial function. Whenever the spinner is created, or the user taps on it, the method will be called to update the spinner's list of values.

Using a dynamic property: You can define a dynamic property in your Kivy app Python code that retrieves a list of elements from a data source or generates them and sets it as the spinner's values. Whenever the data source changes or the dynamic property is updated, Kivy automatically updates the spinner's values.

Using Kivy language: Kivy language provides a way to automatically populate a spinner using a loop. You can use the 'for' loop syntax to define the elements to be added to the spinner's list of values. Kivy will then create the list of values dynamically during runtime.

Using a custom spinner widget: You can create a custom widget that inherits from Kivy's spinner class and overrides its properties, such as values, and methods to generate the list of elements. This way, you will have full control over the content of the spinner's values.