Yes, please! It would be easier to maintain a complex prototype if we had variables especially if you don't plan well your components you end up doing a lot of copy / paste to update the values.

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Add support to the System Variables like time, date, battery level, internet connection level and language. This can be helpful for multilanguage prototypes or some mobile apps prototypes that interacts with these variables and show timestamps, deny access for some artboards because of the internet connection that is required to access some part of an app and a lot more things can be made with this feature.

In a form based prototype there is a field in which you can select a date. I want the default to be the date of today, and that this automatically updates accordingly. So if you open up the prototype the next day, this displays the current date, without having to open up the design file.

TL/DR: Adding a text variable: date.

+1