iconv lacks Windows-1250 / ISO-8859-2 support

[kolos]

Bref’s PHP runtime includes iconv, but Central European encodings are unavailable.

Environment:
al2023

arn:aws:lambda:eu-central-1:873528684822:layer:php-83:19

Minimal reproduction:

<?php

$source = hex2bin('f5fbc1c9'); // őűÁÉ in Windows-1250

var_dump(iconv(
    'WINDOWS-1250',
    'UTF-8',
    $source
));

Expected:

őűÁÉ

Actual:

iconv(): Wrong encoding, conversion from
"WINDOWS-1250" to "UTF-8" is not allowed

ISO-8859-2, CP1250, and MS-EE fail as well, while ISO-8859-1 and CP1252 work.

It looks like the runtime ships only a minimal subset of glibc gconv modules. Could the missing Central European conversion modules be included?