How to achieve it.

Here is the work i did.

app/code/Custom/OverrideCompany/view/base/ui_component/company_form.xml

 <form xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Ui:etc/ui_configuration.xsd">
    <fieldset name="general">
        <field name="account_number" formElement="input">
            <argument name="data" xsi:type="array">
                <item name="config" xsi:type="array">
                <item name="disabled" xsi:type="boolean">true</item>
                    
                    <item name="source" xsi:type="string">Account Number</item>
                </item>
            </argument>
            <settings>
                <validation>
                    <rule name="required-entry" xsi:type="boolean">true</rule>
                </validation>
                <dataType>text</dataType>
                <label translate="true">Account Number</label>
                <dataScope>account_number</dataScope>
            </settings>
        </field>

    </fieldset>
</form>

app/code/Custom/OverrideCompany/Setup/InstallSchema.php

   <?php
namespace Custom\OverrideCompany\Setup;

use Magento\Framework\Setup\InstallSchemaInterface;
use Magento\Framework\Setup\SchemaSetupInterface;
use Magento\Framework\Setup\ModuleContextInterface;

class InstallSchema implements InstallSchemaInterface {
    const COMPANY_TABLE_NAME = 'company';

    public function install(SchemaSetupInterface $setup, ModuleContextInterface $context){
        $setup->startSetup();
        $table = $setup->getTable(self::COMPANY_TABLE_NAME);

        $columns = [
            'account_number',
                [
                    'type' => \Magento\Framework\DB\Ddl\Table::TYPE_TEXT,
                    'length' => 11,
                    'nullable' => true,
                    'comment' => 'Account Number'
            ],
        ];
        $connection = $setup->getConnection();
        foreach ($columns as $col_name => $col_array){
            $connection->addColumn($table, $col_name, $col_array);
        }
        $setup->endSetup();
    }
}

app/code/Custom/OverrideCompany/Setup/UpgradeSchema.php

<?php

namespace Custom\OverrideCompany\Setup;

use Magento\Framework\Setup\UpgradeSchemaInterface;
use Magento\Framework\Setup\ModuleContextInterface;
use Magento\Framework\Setup\SchemaSetupInterface;

class UpgradeSchema implements UpgradeSchemaInterface
{

    /**
     * {@inheritdoc}
     */
    public function upgrade(
        SchemaSetupInterface $setup,
        ModuleContextInterface $context
    ) {
        $installer = $setup;

        $installer->startSetup();
        if (version_compare($context->getVersion(), '1.0.0', '<')) {
                $installer->getConnection()->addColumn(
                $installer->getTable('company'),
                'account_number',
                [
                    'type' => \Magento\Framework\DB\Ddl\Table::TYPE_TEXT,
                    'length' => 11,
                    'nullable' => true,
                    'comment' => 'Account Number'
                ]
            );
        }
        $installer->endSetup();
    }
}

How to achieve it.