[Charts] Improve the calculation creation

When creating calculations, the four basic arithmetic operations are some of the most frequently used features. However, in the current Charts experience, creating even slightly complex expressions requires configuring a large number of Functions.
For example, the Add Function can only add two time series at a time, so even for a simple expression like A + B + C + D + E, you need to place four separate Add Functions.
Could this process be made simpler so that basic arithmetic can be built more easily?
Ideally, it would be great if users could enter an expression directly on the “Create calculation” screen—for example:
A + (B - C) / (B + C) * 100 + D × E
and Charts would automatically generate the necessary Functions.
If the expression format followed something similar to Excel, most users would find it intuitive and easy to use.