Different models in child and Parent Templates

I am using parent template as base which has a side nav bar. the child template keeps changing with clicking of buttons.

 

My child template changes correctly with call to different views through the URLs.

Now I want to add some data from model i the parent template irrespective of the view/model  or URL being called in the child template.

is there any easy was to do this.

for now I am writing additional context variables for parent template for all the child views. But this is not feasible

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