// Row is a map[string]any, implemented as bigquery.ValueSaver
rows := []Row{
    {
        "CreatedAt": time.Now(),
        "Name":      "Alice",
        "Preferences": map[string]any{
            "Color": "Red",
        },
    },
    {
        "CreatedAt": time.Now(),
        "Name":      "Bob",
        "Age":       30,
    },
}

var mergedSchema bigquery.Schema
for _, row := range rows {
    // If you use bigquery.InferSchema, it will fail to infer the schema of nested struct.
    schema, err := bqs.Infer(row)
    if err != nil {
        return err
    }

    // Merge the schema of each row
    mergedSchema, err = bqs.Merge(mergedSchema, schema)
    if err != nil {
        return err
    }
}

// Create a new table with the schema that is combined from all rows
newMeta := &bigquery.TableMetadata{Schema: mergedSchema}
if err := table.Create(ctx, newMeta); err != nil {
    return err
}

// Insert all rows to the created table
if err := table.Inserter().Put(ctx, rows); err != nil {
    return err
}