Support arithmetic expressions in numerical inputs

[sed-i]

• [x] I agree to follow the Code of Conduct that this project adheres to.
• [x] I have searched the issue tracker for a feature request that matches the one I want to file, without success.

Is your feature request related to a problem? Please describe. When inputting dimensions for a custom page size I have to calculate elsewhere and input the result. For example I want a third of a letter paper so I need to calculate 11 inch / 3 elsewhere.

Describe the solution you'd like Numerical input boxes could support arithmetic expressions so I wouldn't have to open up a calculator for calculating 11/3.

Describe alternatives you've considered Manually calculate values elsewhere.

Additional context This will be handy not just for page size but many other numerical inputs.

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