Version 12 fixtures weird behaviour

I have used fixtures in version 11 now I am using it in version 12 it is not behaving the same, I made changes to a field using customize form exported it to my custom app it created the folder custom with json file of changes.
Added fixtures = [“Custom Field”] in hooks.py
now when I export the fixtures it creates the fixtures file but the changes I made are not there instead it gives me this
[
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“dt”: “Project”,
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“fieldname”: “github_sync_id”,
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“label”: “GitHub Sync ID”,
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“modified”: “2020-02-24 12:26:06.507327”,
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},
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“doctype”: “Custom Field”,
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“fieldname”: “hub_sync_id”,
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“label”: “Hub Sync ID”,
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“doctype”: “Custom Field”,
“dt”: “Supplier”,
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“fieldname”: “irs_1099”,
“fieldtype”: “Check”,
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“insert_after”: “tax_id”,
“label”: “Is IRS 1099 reporting required for supplier?”,
“length”: 0,
“modified”: “2020-02-23 20:58:26.626845”,
“name”: “Supplier-irs_1099”,
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“dt”: “Print Settings”,
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“fieldtype”: “Check”,
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“insert_after”: “with_letterhead”,
“label”: “Compact Item Print”,
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“modified”: “2020-02-24 12:26:41.442741”,
“name”: “Print Settings-compact_item_print”,
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},
{
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“doctype”: “Custom Field”,
“dt”: “Address”,
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“fieldname”: “tax_category”,
“fieldtype”: “Link”,
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“insert_after”: “fax”,
“label”: “Tax Category”,
“length”: 0,
“modified”: “2018-12-28 22:29:21.828090”,
“name”: “Address-tax_category”,
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“options”: “Tax Category”,
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},
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“insert_after”: “allow_print_for_cancelled”,
“label”: “Print taxes with zero amount”,
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“modified”: “2020-02-24 12:26:41.543901”,
“name”: “Print Settings-print_taxes_with_zero_amount”,
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}
]