What about a blueprint configuration like the one below?
<blueprint
xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0";
xmlns:jpa="http://aries.apache.org/xmlns/jpa/v1.1.0";
xmlns:cm="http://aries.apache.org/blueprint/xmlns/blueprint-cm/v1.1.0";>
<cm:property-placeholder persistent-id="my_object_id">
<cm:default-properties>
<cm:property name="jpa_param_1" value="A"/>
<cm:property name="jpa_param_2" value="B"/>
</cm:default-properties>
</cm:property-placeholder>
<bean id="my_object">
<jpa:context property="em" unitname="unit_1" type="EXTENDED">
<map>
<entry key="jpa_param_1" value="${jpa_param_1}" />
<entry key="jpa_param_2" value="${jpa_param_1}" />
</map>
</jpa:context>
</bean>
</blueprint>
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