Modify paragraph controls to add "Lead" and "Endmark" toggles.

modify-paragraph-controls.js

import { createHigherOrderComponent } from '@wordpress/compose';
import { InspectorControls } from "@wordpress/block-editor";
import { __experimentalToolsPanelItem as ToolsPanelItem, ToggleControl, } from '@wordpress/components';
import { __ } from '@wordpress/i18n';

const editParagraphAttributes = function ( settings, name ) {
	if ( 'core/paragraph' === name ) {

		settings.supports = {
			...settings.supports,
			dimensions: false,
			anchor: false,
			color: false,
			typography: false
		};

		settings.attributes = {
			...settings.attributes,
			endMark: {
				type: 'boolean',
			},
			lead: {
				type: 'boolean',
			}
		}
	}
	return settings;
};

const editParagraphEdit = createHigherOrderComponent( ( BlockEdit ) => {

	return ( props ) => {
		const { attributes, setAttributes, clientId } = props;
		return (
			<>
				<BlockEdit { ...props } />
				<InspectorControls group="typography">
					<ToolsPanelItem
						hasValue={ () => !! attributes.endMark }
						label={ __( 'Endmark', 'example' ) }
						panelId={ clientId }
					>
						<ToggleControl
							label={ __( 'Endmark', 'example' ) }
							checked={ attributes.endMark }
							onChange={ ( value ) =>
								setAttributes( { endMark: value } )
							}
							help={ __( 'Toggle to show a end mark.', 'example' ) }
						/>
					</ToolsPanelItem>
					<ToolsPanelItem
						hasValue={ () => !! attributes.lead }
						label={ __( 'Lead', 'example' ) }
						panelId={ clientId }
					>
						<ToggleControl
							label={ __( 'Lead', 'example' ) }
							checked={ attributes.lead }
							onChange={ ( value ) =>
								setAttributes( { lead: value } )
							}
							help={ __( 'Toggle to enable a lead.', 'example' ) }
						/>
					</ToolsPanelItem>
				</InspectorControls>
			</>
		);
	};
}, 'withInspectorControl' );

export { editParagraphAttributes, editParagraphEdit };