How to add a new attribute to core wp block editor without npm?

Add question

Username* Please type your username .

E-Mail* Please type your E-Mail .

Question Title* Please choose an appropriate title for the question to answer it even easier .

Category Please choose the appropriate category so others can easily search your question.

Tags Please choose suitable Keywords Ex : question , poll .

Poll This question is a poll ? If you want to be doing a poll click here .

Featured image

Browse

Details*

Ask Anonymously Anonymous asks

Video description Do you need a video to description the problem better ?

Video type Choose from here the video type .

Video ID Put here the video id : https://www.youtube.com/watch?v=sdUUx5FdySs EX : 'sdUUx5FdySs'.

Notified Notified by e-mail at incoming answers.

Terms* By asking your question, you agree to the Terms of Service and Privacy Policy.

Captcha*

How to add a new attribute to core wp block editor without npm?

Question

I need to add a new attribute with color selector to a core paragraph/heading block. What would be bracets-color="#5a6a81" for example. I’ve been googling all day and only found examples with npm installation. But I can’t install it on wp hosting.

I saw the article https://jeffreycarandang.com/extending-gutenberg-core-blocks-with-custom-attributes-and-controls/ but it doesn’t help without the npm.