OK, I am sorry for that. COLMAP export is planned for next releases. Instead, can you try to add this script to the calibration.xml file if it works for you?
<format id="{280B11A4-F9A3-47D1-AE58-C0DEA33487D8}" mask="*.txt" descID="9001" desc="TiePoints Text Format" writer="cvs" undistortImages="always" exportImages="0" requires="component">
<body>The files are in the same folder.$[b]
$WriteFile("Images.txt",
$[a]$ExportPoints(
Point index: $(index)
$ExportTrack(
Image index: $(imageIndex)
Feature index: $(featureIndex)
Real X [Pixel]: $((x + 0.5) * width)
Real Y [Pixel]: $((y + 0.5) * height)
$ExportCamera(cameraIndex,ImageName: $(imageName)$(imageExt))
)
)$[b]$[n]
)
</body>
</format>