Allow Map and List in Nuxeo Platform Rendering templateParam

<fields xmlns:dt="http://www.nuxeo.org/DocumentTemplate">
  <dt:field name="account" type="Map">
    <dt:field name="owner" type="Map">
      <dt:field name="firstname" type="String" value="Benjamin"/>
      <dt:field name="lastname" type="String" value="JALON"/>
    </dt:field>
    <dt:field name="type" type="String" value="checking"/>
    <dt:field name="operations" type="list">
      <dt:field name="op1" type="Map">
        <dt:field name="date" type="Date" value="2017-07-14 13:14:15.678"/>
        <dt:field name="value" type="String" value="$ 200.20"/>
        <dt:field name="isPositive" type="Boolean" value="true"/>
      </dt:field>
      <dt:field name="op2" type="Map">
        <dt:field name="date" type="Date" value="2017-07-15 13:10:15.678"/>
        <dt:field name="value" type="String" value="-$ 40.27"/>
        <dt:field name="isPositive" type="Boolean" value="false"/>
      </dt:field>
    </dt:field>
  </dt:field>
</fields>

Hello ${account.owner.firstname} ${account.owner.lastname},
Here are the operations of the account ${account.number} for this month:
            DATE          |   VALUE  | IS POSITIVE
 <#list account.operations as operation>
 ${operation.date?datetime} | ${operation.value} | ${operation.isPositive?string("yes", "no")}
 </#list>