How to add bookmark feature on blogger website

<div class='hartomy-bookmark-btn' data-quantity='1' expr:data-borkimage='resizeImage(data:post.featuredImage, 400, &quot;16:9&quot;)' expr:data-id='data:post.id' expr:data-link='data:post.url' expr:data-title='data:post.title'><svg class='line' viewBox='0 0 24 24'><g transform='translate(4.500000, 2.500000)'><path d='M7.47024319,0 C1.08324319,0 0.00424318741,0.932 0.00424318741,8.429 C0.00424318741,16.822 -0.152756813,19 1.44324319,19 C3.03824319,19 5.64324319,15.316 7.47024319,15.316 C9.29724319,15.316 11.9022432,19 13.4972432,19 C15.0932432,19 14.9362432,16.822 14.9362432,8.429 C14.9362432,0.932 13.8572432,0 7.47024319,0 Z'></path><line transform='translate(-4.500000, -2.500000)' x1='12' x2='12' y1='6' y2='12'></line><line transform='translate(-4.500000, -2.500000)' x1='15' x2='9' y1='9' y2='9'></line></g></svg>
</div>

<script>//<![CDATA[
// source code : https://www.hartomy.com/2020/09/cara-membuat-tombol-bookmark-di-blogger.html
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