libxml-um-perl binary package in Ubuntu Jammy riscv64

 The XML::UM module provides methods to convert UTF-8 strings to any XML
 encoding that XML::Encoding supports. It creates mapping routines
 from the .xml files that can be found in the maps/ directory in the
 XML::Encoding distribution. Note that the XML::Encoding distribution
 does install the .enc files in your perl directory, but not the.xml
 files they were created from. That's why you have to specify $ENCDIR
 as in the SYNOPSIS.
 .
 This implementation uses the XML::Encoding class to parse the .xml
 file and creates a hash that maps UTF-8 characters (each consisting
 of up to 4 bytes) to their equivalent byte sequence in the specified
 encoding. Note that large mappings may consume a lot of memory!
 .
 Future implementations may parse the .enc files directly, or do the
 conversions entirely in XS (i.e. C code).

Source package