Using DocumentRoot as a variable in other sections of Apache config file

Is there a way to use the DocumentRoot as a variable in further sections of a site's config file in Apache?

Something as below:

DocumentRoot /var/www/myNiceRoot

<Directory $DocumentRoot/mySubDir> ... </>

You can define a variable and then use that

Define droot /var/www/html

and then use it later

DocumentRoot ${droot}/site1

and so on.

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