Default modular blueprints for all modular templates?

Hi guys, developing a theme Im getting many common fields between all modular templates. I would like to create just 1 blueprint file to setup common options and then add specific fields on each module. Is it possible?

Im trying with this code in blueprints/modular/default.yaml but its not working
'@extends':
type: modular/default
context: blueprints://pages

I think the code should be -

title: Name of your Blueprint
extends@: modular/default