Hi,

To insert a new tax in Odoo for the French chart of accounts, you can indeed follow a similar approach to how the account.tax-fr.csv file in the l10n_fr module works. CSV files in Odoo are typically loaded during module installation through the data section in the module's manifest file (__manifest__.py).

For example you can refer the following code:

{

    'name': 'Custom Tax Module',

    'version': '17.0.1.0.0',

    'depends': ['account'],

    'data': [

        'data/account.tax.custom.csv',

    ],

}

Hope this helps.