Need to create a field called "variant" in docfields

cur_frm.fields_dict['item_component'].grid.docfields[0]
Object { doctype: "DocField", name: "e73d72baf5", creation: "2023-10-03 18:17:07.117010", modified: "2023-10-12 16:20:28.218038", modified_by: "Administrator", owner: "Administrator", docstatus: 0, parent: "Parent", parentfield: "fields", parenttype: "DocType", … }
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allow_bulk_edit: 0
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allow_in_quick_entry: 0
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allow_on_submit: 0
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bold: 0
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collapsible: 0
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columns: 0
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creation: "2023-10-03 18:17:07.117010"
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docstatus: 0
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doctype: "DocField"
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fetch_if_empty: 0
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fieldname: "item_group"
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fieldtype: "Link"
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hidden: 0
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hide_border: 0
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hide_days: 0
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hide_seconds: 0
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idx: 1
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ignore_user_permissions: 0
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ignore_xss_filter: 0
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in_filter: 0
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in_global_search: 0
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in_list_view: 0
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in_preview: 0
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in_standard_filter: 0
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is_custom_field: null
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label: "Item Group"
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length: 0
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linked_document_type: "Setup"
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modified: "2023-10-12 16:20:28.218038"
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modified_by: "Administrator"
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name: "e73d72baf5"
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no_copy: 0
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non_negative: 0
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options: "Item Group"
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owner: "Administrator"
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parent: "Parent"
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parentfield: "fields"
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parenttype: "DocType"
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permlevel: 0
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precision: ""
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print_hide: 0
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print_hide_if_no_value: 0
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read_only: 0
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remember_last_selected_value: 0
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report_hide: 0
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reqd: 0
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search_fields: Array []
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search_index: 0
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set_only_once: 0
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show_preview_popup: 0
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translatable: 0
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unique: 0
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<prototype>: Object { … }