set datasource name in Lumira dynamically via JavaScript

Question

Iam using SAP Lumira Designer. I want to set the name of the datasource dynamically. Therefore I add the count in loop to the database name at the end. There are Datasources with the following names:

• DS_AW_CHART_LVL2_01
• DS_AW_CHART_LVL2_02
• DS_AW_CHART_LVL2_03 ...

var dbsource_name = 'DS_AW_CHART_LVL2_0'+index;
TILES.loadCharts(2, index, currentChildNode);
KPI_TILE_LVL2.as(ComponentType.LUM_ASF_TILE_OVERVIEW).setChartConfigAnwesenheit(dbsource_name);

But Iam getting the error Cannot convert from "String" to "DataSourceAlias". How can I solve it?