ZEN report - how to get bold header in displayxlsx $MODE
As stated, I have ZEN report, which I want to render in displayxlsx mode.
Currently it looks like this:

I want it to look like this:
Differences are:
- Bold header
- Cell width fitted to widest row or header
My report definition looks like this:
XData ReportDefinition [ XMLNamespace = "http://www.intersystems.com/zen/report/definition" ]
{
<report xmlns="http://www.intersystems.com/zen/report/definition"
name="MyReport"
sql="SELECT TOP 10 Name,DOB,Age FROM Sample.Person"
runtimeMode="0">
<group name="Person">
<attribute name="name" field="Name"/>
<attribute name="dob" field="Dob"
expression="..ToExcelDate(%val)"/>
<attribute name="age" field="Age"/>
</group>
</report>
}
How can I get bold header and/or adequate cell width?