What are the approaches to show a message for end users inside our home page

I want to add a message inside our modern page under the upper banner, something as follow:-

now i can use the built-in Text web part (as shown above), Or use the Embed web part to show a page containing the message. but the problem with these 2 approaches, is that the message will have a wasted area under it. and users will not be able to dismiss it . now if i were developing a standard asp.net web application,  i would show a jquery message which can allow users to dismiss it and will not consume any space once it got hidden/dismiss. but i am not sure what are the appraochies we can follow to show such as message inside our modern home page?. i found this link which talk abut using page placeholders Use page placeholders from Application Customizer (Hello World part 2) now i will not mention that the appraoch is very lengthy to just show a message, but seems it will show the header on all the pages and not just inside the home page (so not sure if it worth the try...).