A frontend with 2D input and palettes

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Do we have a frontend that supports two-dimensional input with or without command palettes?

Like declaring a fraction as $\frac{a+b}{b+c}$ instead of (a+b)/(b+c), or writing an integral by choosing the symbol from the palette and filling in the dummy arguments?

I have no complaints with Jupyter but this kind of frontend would be very useful especially for non-programmers.