Trying to pass information between templates and template variables

My footer's contents change based on specific pages; I need to conditionally load an additional partial into the footer based on the changes. I'm looking to do that using template variables. Right now, I've got a homepage template where I'm trying to pass a string into a template partial, then into a section tag. Next in the default layout, I want to use a yield tag and conditional to pass the value of that string into another template variable.

Homepage.html template

{{ partial:footer/_footer-cta-vars-partial footer_cta_vars="has-cta" }}

_footer-cta-vars-partial.html template partial

{{ section:footer_cta_var }}
   {{ footer_cta_vars }}
{{ /section:footer_cta_var }}

default.html layout template

I've tried two different approaches. One with a conditional to check the yield's value. And one where I attempt to pass the yield's value directly into the partial's template variable. Neither works.

( Attempt 1 )

{{ if '{ yield:footer_cta_var }'=="has-cta" }}
    {{ partial src="footer/_footer" use_context="true"  css_class_vars="'{ yield:footer_cta_var }'" }}
{{ else }}
    {{ partial src="footer/_footer" use_context="true"  }}
{{ endif }}

.

( Attempt 2 )

{{ partial src="footer/_footer" use_context="true"  css_class_vars="'{ yield:footer_cta_var }'" }}