How to add element in bpmn-js modeler, bpmn:documentation

Hi everyone, now I am trying to set bpmn:documentation.

const modeler = getModeler();     
await modeler.importXML(process.diagram ? process.diagram : defaultDiagram(process.description));

actually there is no documentation in process.diagram(XML)
so I need to add documentation into bpmn:process as a child
result shuld be like this:

  <bpmn:process id="Process_08h5sci" isExecutable="true">
    <bpmn:startEvent id="StartEvent_0ixjfl1" />

Thank you!

What about this question and its answer?