How can I pass content with script?

change this components: "<h1>hello 123</h1>",

I didn't get traits if I use script while creating a custom component. Is there any problem with traits?

well, there are no traits inside your block... If you're trying instead to use a custom component you have to set the type

content: {
        type: 'your-component-type',
        script: "console.log('the element', this)",
        content: "<h1>hello 123</h1>",