How to center FormalImage in report

I am trying to insert a imaging into a Matlab report with class FormalImage. By the default settings, the figure and the caption are left end alignment. How could I set that they can align in center?

The code is

import mlreportgen.report.* 
import mlreportgen.dom.* 

rpt = Report('ms-report','pdf');
fig = FormalImage(figsnapnm);
fig.Caption = 'DAS Snapshot';
fig.Height = '3in';
add(rpt, fig)
close(rpt)
rptview(rpt)

The figure is

Answer 1

[Mary Abbott]

You can create a template based on the default FormalImage template that centers the image and caption.

Create a template based on the default FormalImage template and unzip the template:

mlreportgen.report.FormalImage.createTemplate('centeredImageTemplate', 'pdf')
unzipTemplate('centeredImageTemplate.pdftx', 'centeredImageTemplate_pdftx')

In centeredImageTemplate_pdftx\stylesheets\root.css, add text-align: center; to both FormalImageImage and FormalImageCaption styles:

p.FormalImageImage {
    margin-bottom: 10pt;
    text-align: center;
}
  
p.FormalImageCaption {
    font-size: 10pt;
    color:black;
    white-space: pre;
    -fo-keep-with-previous.within-page: always;
    text-align: center;
}

Zip the template:

zipTemplate('centeredImageTemplate.pdftx', 'centeredImageTemplate_pdftx')

In your code, set the TemplateSrc property of the figure reporter to centeredImageTemplate:

fig = FormalImage(figsnapnm);
fig.TemplateSrc = 'centeredImageTemplate';