First, this documentation page shows several methods of creating lists programmatically:
Note that with these methods, you can first use "Text" to create a text object to be added to the document. Several properties of the text object can be adjusted programmatically. These include the properties 'Bold', 'Italic', 'Color', and 'FontSize'. You can then concatenate these styled text objects into a cell array to be appended as a list.
Below is a short example that generates a report with a list where the items have some of these characteristics:
import mlreportgen.dom.*;
d = Document('myListReport','docx');
b = Text('first item');
b.Bold = true;
it = Text('second item');
it.Italic = true;
bit = Text('third item');
bit.Bold = true;
bit.Italic = true;
fnt = Text('fourth item');
fnt.Color = 'red';
fnt.FontSize = '25';
append(d,{b, it, bit, fnt});
close(d);
rptview(d.OutputPath);