Using Matrix in Expressions - Access the previous row value from expressions

[JaneSjs]

T21052 - rowIndex cannot be passed to get matrix row value
https://surveyjs.answerdesk.io/internal/ticket/details/T21052

I might be necessary to access the value of a previous matrix row in expressions. For instance, to copy the previous row value to the current row. However, the {matrixName[{rowIndex} - 1].colName} expression doesn't work and it is necessary to create a custom function to handle this task.