Support for additional keys such as Integral, Sum, Limit, Matrices, d/dx, etc.

[swiftly-viper]

Hello,

Does anyone know how additional commands can be added to support an expanded keyboard? Additional keys would include Integrals, Summations, Limits, d/dx, and even Matrices. I found an app called "xFormula" that utilizes a keyboard resembling MathEditor. Their keyboard also supports these operations. My goal is to design a keyboard similar to that of applications like Photomath.

Additionally, if anyone can provide advice on how I can update the trigonometric functions to include a placeholder between the parentheses, that would be greatly appreciated.

Thank you for any advice, guidance, and the awesome package.