Is there way to set default value to field 'page with excerpt' in Multiexcerpt Include macro?

[Harshali .]

I wanted to set up a default value for the field  'page with an excerpt' in the Multiexcerpt Include macro. 
The desired default value of Field 'page with an excerpt':  Source Page of the Multiexcerpt. 

I was trying to create a template for documentation, and this feature would be extremely helpful in that. Please let me know if there's an option for that.