How to refine an annotation in order_by if it conflicts with a field of the merged model?

Question

Django

Request:

Post.objects.select_related(
    'blog'
).annotate(
    v=42
).order_by(
    'v'
)

The problem is that Blog has a field named 'v' which ends up ambiguous 'ORDER BY v'. Postgres doesn't understand v is a blog field or annotation.
In jung, you can specify the model in order_by(): 'post__v', 'blog__v'. But I have an annotation and how to refine it - I do not understand. Maybe there is a solution?
Yes, you can change the name of the annotation, but for me it's inconvenient. I want to then refer to the annotation as post.v, and if the 'v' of the blog is needed, then post.blog.v.