We can add popover content on selected text in wordpress block it's available on all blocks which have toolbar like paragraph block, heading bloc …
Plugin Tag: popover
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WP Popover
Easily add Bootstrap popover to your site. You can create custom post and use as popover anywhere in your site with short code.
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I Agree! Popups
Create T&C and disclaimer popups for use across your entire WordPress site or on individual posts and pages.