I want to add the @chunk="to-content" attribute in the ditamap, that ditamap have only .dita files reference not(.ditamap). I am unable to write the logic for this issue.

I want to add the @chunk="to-content" in the second ditamap. if third ditamap have only .dita reference

Please help on this and thank you in advance

First DItamap

<map>
    <topicref href="aag-brd6.dita" format="dita">
        <topicref href="statement_of_income_orr.ditamap" format="ditamap"/>
        <topicref href="disclosures.ditamap" format="ditamap"/>
        <topicref href="financial_statements_and_schedules.ditamap" format="ditamap"/>
    </topicref>
</map>

Second ditamap(First Ditamap Child)

<map>
    <topicref href="statement_of_income_orr.dita" format="dita">
        <topicref
            href="commission_income_and_related.ditamap" format="ditamap"/>
        <topicref
            href="interest_income_and_interest.ditamap" format="ditamap"/>
        <topicref
            href="dividend_income_and_dividend.ditamap" format="ditamap"/>
        <topicref href="principal_transactions__trading_gains.ditamap" format="ditamap"/>
</map>

Third ditamap(Second Ditamap Child)

<map>
    <topicref href="aag-brd6_dividend_income_and_dividend/aag-brd6_dividend_income_and_dividend.dita" format="dita"/>
</map>