When creating/modifying a bank account with Accounting >> Configuration >> Accounts >> Setup your Bank Accounts there is a field Bank Account Type that only ever has a single option Normal Bank Account.

Naively, I tried editing res_partner_data.xml like this ...

        <!-- Default bank account description -->
    <record id="bank_normal" model="res.partner.bank.type">
        <field name="name">Savings Account</field>
        <field name="name">Current Account</field>
        <field name="code">bank</field>
    </record>

... but that file seems to be read only when the module is installed, and even then only the last value gets used.

Is there a way to add account types to the list?