I’m afraid not; there are a few direct high-speed trains from Paris Montparnasse every day though. To get there from Paris CDG Airport you’ll need to take the RER B line to St-Michel Notre-Dame underground station then change onto Metro line 4 (purple) as far as Montparnasse-Bienvenue, from which it’s just a short walk (with travelators) through a tunnel to the Montparnasse terminus. You’ll need to pay separately for the RER and Metro trip as the Paris urban network isn’t included with a Eurail pass.

Hope this helps :-)

Traveling on March 2023. Is it better to purchase rail tickets now?

No, thats WAAAAAY too early. From 3-4 mnth advance.

It is (noone here uses ´bullet´ and   after the recent Texas-schol-whoś next-shooting)-thart was an lame translation of the Japanese at their time) impossible to use superfast TGV trains from airpt by changeing at some other point-but its much more cumbersome as going via paris=also cumbersome with 2 changes needed.