is scroll lazy load without external script from wp possible?

i dont want include different js files because of slowing if it is not necessary. i dont know js,jquert etc. so i want only copy paste.is scroll lazy load without external script from wp possible in wp? and how ? if the answer is no, can somebody give me a simple code with explanation to copy paste?

note:

i need lazy load for this:

if ( function_exists(‘journalite_author_bio’) ) {
journalite_author_bio();
}

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