Is there a way to update an object's property in twig?

An object like the following is passed to twig:

object
   property1
   property2

I would like to update property1 like this:

{% set object.property1 = 'somenewvalue' %}

The above code does not work, but is it possible to do something like this in twig? If not, is there a way to write an extension or macro to do this?

php twig
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