I have a Wordpress blog (blog.xxx.com). I have a nuxt personal website yyy.com which is hosted on aws.
Now I wish to map or migrate the Wordpress blog (blog.xxx.com)
Well despite Johannes is perfectly clear for me, i'll try to simplify.
Clone WordPress files from blog.xxx.com to yyy.com/blog directory. (not sure how your server is configured, but probably you'll be able to access it.)
Clone Database to new server.
Run sql replace queries
UPDATE wp_options SET option_value = replace(option_value, 'https://blog.xxx.com', 'https://yyy.com/blog') WHERE option_name = 'home' OR option_name = 'siteurl';
UPDATE wp_posts SET guid = replace(guid, 'https://blog.xxx.com','https://yyy.com/blog');
UPDATE wp_posts SET post_content = replace(post_content, 'https://blog.xxx.com', 'https://yyy.com/blog');
UPDATE wp_postmeta SET meta_value = replace(meta_value,'https://blog.xxx.com','https://yyy.com/blog');
update your wp-config.php to match your new database.
login to yyy.com/blog/wp-admin
go to settings and update your permalinks