JetFormBuilder Set total amount for multiple number field

code.html

<script>
    document.addEventListener( 'DOMContentLoaded', function() {
		
		const {
			addAction,
		} = window.JetPlugins.hooks;
		
		addAction( 'jet.fb.observe.after', 'total-amount', init );
	
		function init( observable ) {
	
			if ( ! observable?.rootNode ) {
			    return;
			}
			
			const settings = observable.rootNode.querySelector( '.total-amount' )?.dataset;
			
			if ( ! settings ) {
			    return;
			}
			
			if ( ! settings.amount || ! settings.fields ) {
			    return;
			}
			
			const inputNames = settings.fields.split(',');
			
			let inputs = [];
			
			for ( const name of inputNames ) {
			    const input = observable.getInput( name );
			    if ( ! input ) {
			        continue;
			    }
			    inputs.push( input );
			}
			
			for ( const input of inputs ) {
			    input.value.watch( function() {
		            const others = inputs.filter( function( otherInput ) {
		                return input.name !== otherInput.name;
		            } );
		            
		            const othersSum = others.reduce( function( acc, cur ) {
		                return +acc + +cur.value.current;
		            }, 0 );
		            
		            if ( othersSum + +input.value.current > settings.amount ) {
		                input.value.current = settings.amount - othersSum;
		            }
		        } );
			}
		}
	} );
</script>

settings.html

<div class="total-amount" data-fields="num1,num2,num3,num4" data-amount="10"></div>