Creating a work manager leads to invalid server configuration

Creating a JCA workmanager in admin console does not work properly. The attributes "queue-length" and "max-threads" expect type INT, but admin console passes something which causes that configuration xml will look this way:

<workmanager name="asd">
<short-running-threads allow-core-timeout="false">
<queue-length count="

{"count" => 10,"per-cpu" => 20}"/>
<max-threads count="{"count" => 10,"per-cpu" => 20}

"/>
</short-running-threads>
</workmanager>

It will cause the server will be unable to boot up because XML parsing will fail.

These attributes should also be configurable, all these values seem to be hardcoded and impossible to change.