I am sory for spaming form, but I fund solution.
For future readers that is workaround:
When writing razor using .NET core tag helpers properties that accepts string as function names shod not have quotes
<jqx-grid-column editable="true" datafield="rb1" init-editor=initNumEditor() text="Rabat1" cells-format="p2" width="80" cell-end-edit=setMartMpcNaGriduCijena() cells-align="HorizontalAlignment.Right" align="center" column-type="numberinput" cell-begin-edit="function(row, datafield, columntype, value){
if (row==0){
return false;
};
}" ></jqx-grid-column>
Take look for properies init-editor or cell-end-edit they are call function names whiteout quotes ” even it accepts sting.