Auto-select authors for posts during WordPress import. They must already be assigned to the project. Enable jQuery in a plugin or functions.php, and paste this in the browser console.

wp-author-import-auto-select.js

( function( $ ) {
	$( '#authors li' ).each( function( key, value ) {
		const fullInfo = $( this ).children( 'strong' ).first().html(),
			name = fullInfo.replace( /\s\([^\)]+\)/gi, '' ),
			username = /\(([^)]*)\)/.exec( fullInfo )[ 1 ];
		let selectName = '';

		$( this ).find( 'select' ).first().children( 'option' ).each( function() {
			selectName = $( this ).html();
			if ( selectName == fullInfo ) {
				console.log( 'Comparing ' + selectName + ' to ' + fullInfo + '.\n' );
				$( this ).attr( 'selected', 'selected' );
			} else if ( selectName == name ) {
				console.log( 'Comparing ' + selectName + ' to ' + name + '.\n' );
				$( this ).attr( 'selected', 'selected' );
			} else if ( selectName == username ) {
				console.log( 'Comparing ' + selectName + ' to ' + username + '.\n' );
				$( this ).attr( 'selected', 'selected' );
			}
		} );

		if ( '0' === $( this ).find( 'select' ).first().val() ) {
			$( this ).find( 'select' ).first().val( 1 ); // Default User.
		}
	} );
}( jQuery ) );