You can try the following, if you need to define the CMB2 library.
The actual gamipress
text domain seems standard, although it seems to have numerous errors.
<?xml version="1.0" encoding="utf-8"?>
<bundle name="GamiPress">
<domain name="gamipress">
<project name="GamiPress" slug="gamipress">
<source>
<directory>.</directory>
<exclude>
<directory>libraries/cmb2</directory>
</exclude>
</source>
<target>
<directory>languages</directory>
</target>
<template>
<file>languages/gamipress.pot</file>
</template>
</project>
</domain>
<domain name="cmb2">
<project name="CMB2" slug="cmb2">
<source>
<directory>libraries/cmb2</directory>
<exclude>
<directory>libraries/cmb2/languages</directory>
</exclude>
</source>
<target>
<directory>libraries/cmb2/languages</directory>
</target>
<template>
<file>libraries/cmb2/languages/cmb2.pot</file>
</template>
</project>
</domain>
<exclude>
<directory>integrations/invite-anyone/language</directory>
</exclude>
</bundle>