[question] Extending settings and options with new `python_requires` syntax

I am trying to migrate my recipes to use the new python_requires syntax as described in the documentation.

However, I cannot find a way to correctly extend or override options and settings from the base conanfile.

In the old python_requires, I used to do this:

from conans import python_requires, tools

base = python_requires('MyBaseConanFile/1.0.0@company/stable')

class MyPackage(base.MyBaseConanFile):
    settings = ("os_build", "arch_build") + base.MyBaseConanFile.settings
    options = dict(base.MyBaseConanFile.options, **{
        'another_option': [True, False]
    })
    default_options = dict(base.MyBaseConanFile.default_options, **{
        'another_option': True
    })

How to achieve the same with the new syntax?

The following does not work:

class MyPackage(ConanFile):
    python_requires = 'MyBaseConanFile/1.0.0@company/stable'
    python_requires_extend = "MyBaseConanFile.MyBaseConanFile"
 
    options = dict(self.python_requires_extend['MyBaseConanFile.MyBaseConanFile'].options, **{
        'another_option': [True, False]
    })

The self is not available in class attribute context. The documentation says nothing about that case. Is this even possible with the new syntax?

[memsharded]

init() method for this will be released in Conan 1.24

[DoDoENT]

Just a side note: Until this gets resolved, I managed to create a forward-compatible base conanfile which works with both the current version of python_requires and should work with the new syntax:

Base conanfile:

class MyBaseConanFile(object):
    options = {
        'base_option': [True, False]
    }
    settings = "os", "compiler", "build_type", "arch"

class MyBaseConanFilePkg(ConanFile):
    name = "MyBaseConanFile"
    version = "1.0.0"

and the usage in current models is as follows (notice the multiple inheritance):

from conans import python_requires, ConanFile

base = python_requires('MyBaseConanFile/1.0.0@company/stable')

class MyPackage(base.MyBaseConanFile, ConanFile):
    settings = ("os_build", "arch_build") + base.MyBaseConanFile.settings
    options = dict(base.MyBaseConanFile.options, **{
        'another_option': [True, False]
    })
    default_options = dict(base.MyBaseConanFile.default_options, **{
        'another_option': True
    })

and the (expected) future usage would be something like:

class MyPackage(ConanFile):
    python_requires = 'MyBaseConanFile/1.0.0@company/stable'
    python_requires_extend = "MyBaseConanFile.MyBaseConanFile"
 
    @classmethod
    def python_require_extend_class(cls, c):
        cls.options = c.options + cls.options
        cls.settings = c.settings + cls.settings

    options = {
        'another_option': [True, False]
    }
    settings = "os_build", "arch_build"