Wordpress in subdirectory

wordpress and nginx both have instructions on how to configure nginx to work with wordpress.

https://codex.wordpress.org/Nginx
and
https://www.nginx.com/resources/wiki/start/topics/recipes/wordpress/

both assume a server dedicated to the wordpress site.

My situation is one that has the main symfony site at https://www.mydomain.com and I want the wordpress blog to be at https://www.mydomain.com/blog/

The server is configured for mydomain.com. I have a location for a forum package at /boards/ that works fine. However, I had extreme difficulties even getting /blog/ to load a standard index file.

One piece of the wordpress codex or nginx recipe that I haven't been able to figure out how to use is the upstream php block to abstract backend connections. Is that critical?
Is there a way for me to still use the upstream php with just one location?

I've attached my nginx config. Please let me know if I can provide more information, and thank you in advance for any help you can give me!

I cannot provide a link to what is happening with this config, but I can tell you that the wordpress index file is being hit. Unfortunately it's being downloaded instead of run though in Chrome.