I made an Mac OS PKG installer for my app, using pkgbuil and productbuild. In the installer window there are standard installation steps like "Introduction", "Red me" ... "Summary". I want to add my text in the "Summary" step. Is it possible to customize the "Summary" page or replace it with my own page?

I created my own page (bundle), and tried to remove the FinishUp page in the InstallerSections.plist file and insert my own page in its place, but it did not work, both pages are displayed.
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>SectionOrder</key>
<array>
<string>Introduction</string>
<string>ReadMe</string>
<string>License</string>
<string>Target</string>
<string>PackageSelection</string>
<string>Install</string>
<string>MyFinishUp.bundle</string> <!-- I want to replace the standard one -->
<!--<string>FinishUp</string>-->
</array>
</dict>
</plist>