Component to disable dimension settings based on block context. https://jeffreycarandang.com/restrict-block-settings-based-on-post-type-user-roles-or-block-context/

disable-block-settings.js

import { select } from '@wordpress/data';
import { addFilter } from '@wordpress/hooks';

/**
 * Component to disable dimension settings based on block context.
 *
 * @param {Object} settings - The block settings object.
 * @param {string} settingsName - The name of the settings being modified.
 * @param {string} clientId - The block id.
 * @param {string} blockName - The block name.
 * @returns {Object} The updated block settings object.
 */
const disableDimensionSettings = (settings, settingsName, clientId, blockName) => {

	// Retrieve current user with capability to update settings
	const { canUser } = select('core');
	const currentUser = canUser('update', 'settings');

	// Retrieve the current post type
	const { getCurrentPostType } = select('core/editor');
	const currentPostType = getCurrentPostType();
	
	// Disable these block settings.
    	const disabledBlockSettings = [
        	'spacing.padding',
        	'spacing.margin',
    	];

	if (
		disabledBlockSettings.includes( settingsName ) &&
		currentPostType === 'page' &&
		!currentUser // Add this condition for Admin only access
	) {
		return false;
	}

	return settings;
};

addFilter(
	'blockEditor.useSetting.before',
	'my-plugin/disable-dimension-settings',
	disableDimensionSettings
);