Export two images side by side on header pdf

I have been using this plugin for data table and exporting Excel and PDF files. My problem comes with PDF file export, I want to add two images on header page side by side but the only result that I got is an image in a row and the other on the next line, this is part of my code:

                 customize: function (doc) {
                    
                    if (doc) {
                        doc.content.splice(0, 0, [{
                            margin: [0, 0, 0, 0],
                            alignment: 'left',
                            image: 'base64_Image',
                            width: 100,
                            height: 40,
                        },{
                            margin: [0, 0, 0, 0],
                            alignment: 'right',
                            image: 'base64_Image',
                            width: 100,
                            height: 40,
                        }]);

                        console.log(doc);
                    }
                }

and this is the result:

Regards