Format footer values in ui-grid

if you need the after decimal point to show two values then use custom template functionality in grid options

       {
            field: 'ORGINAL_FUNC_AMOUNT',
            displayName: 'CR A/C',
            aggregationType: uiGridConstants.aggregationTypes.sum,
            footerCellTemplate: '<div class="ui-grid-cell-contents" >Total: {{col.getAggregationValue() | number:2 }}</div>'
        }

The templates you had tried will work for the normal cell values but your are trying to get the template work on a aggregate value.

To get the aggregate value for the column inside a template you can use {{col.getAggregationValue()}} and add your format options.

Since you want to have two decimals this would be more like {{col.getAggregationValue() | number:2 }}

Also remember the template will be different if you have column filters enabled on the grid.