Create in Blockly a block that allows easy replacement of variables like the String.format in Java

In general this will enable to write easily something like the following in Java String.format(""" apiVersion: examples.osl.etsi.org/v1alpha1 kind: MyCalculator metadata: name: mycalculator.examples.osl.etsi.org spec: parama: %d paramb: %d action: '%s' """ ,getCharValNumber("Positioning support"), getCharValNumber("Group communication support"), "SUM" );