JS

jQuery(document).ready(function($)) {
	var preventSubmit = true
	
	$('.acf-field[data-name="repeater_value"]').hide()
	
	$('.wp-admin.post-type-page form#post').on('submit', function(e) {
		if ( ! preventSubmit ) {
			return
		}
		
		e.preventDefault()
		var table = []
		
		$('.acf-field[data-name="repeater_name"] .acf-row:not(.acf-clone)').each(function(row){
			table[row] = []
			$(this).find('input').each(function(column){
				table[row][column] = $(this).val()
				$(this).attr('disabled', true)
			})
		})
		
		$('.acf-field[data-name="repeater_value"] textarea').val(JSON.stringify(table))
		
		preventSubmit = false
		$(this).submit()
		preventSubmit = true
		
		$('.acf-field[data-name="repeater_name"] .acf-row input').removeAttr('disabled')
	})
})

PHP

add_action( 'acf/load_value/name=repeater_name', function( $value, $post_id, $field ) {
	$table     = json_decode( get_field('repeater_value', $post_id) );

	if ( ! $table ) {
		return $value;
	}
	
	$keys      = wp_list_pluck( $field['sub_fields'], 'key' );
	$new_value = array();

	foreach ( $table as $row => $columns ) {
		foreach ( $columns as $column => $value ) {
			$new_value[ $row ][ $keys[ $column ] ] = $value;
		}
	}

	return $new_value;
}, 10, 3 );