I have observed that Conditional Formatting in Spreadhseet is not supported. Please add support for the same as it is very important feature of XLSX. during financial calculation this feature plays an important role. Here is the issue that needs a fix.
1. Open https://demos.telerik.com/kendo-ui/spreadsheet/index
2. Check attached file CellColorFormula.xlsx, conditional formatting set for B2, C2, D2
3. Import attached file CellColorFormula.xlsx
4. Check Cells B2, C2, D2 and try to change values for A2, C2, D2
5. None of the conditional formatting is working