Import WordPress sitemaps into Django sitemaps

I am trying to refer to the WordPress blog through my sub domain. example –

blog.example.com

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WordPress is hosted on GoDaddy

My main app (main domain) is on Django (hosted on Heroku). Have site maps set up on Django apps as well under:

example.com/site maps.xml

How do I integrate the two sitemaps so that when I go to example.com/site maps.xml I should see sitemaps from both? Is there a way?