Well yes but this options must be very limited since some payloads on some planes will change their BR for sure if the devs can make that yes but first they better make good plane lines for all BRs and later they can introduce that.
Tu-1 is not a jet its a bomber but its made after the jet even since the jet 1946 the Tu-1 is 1947 thats why I didnt add this one.
They wont be China TT (I have all the Chinese squads Im sure we wont get more TT). 31-35 built at Moscow Menzhinskii factory most of them where used for transport since they are interwar planes but as a starting bomber will do since it has limited payload to a single 250 kg bomb. Thatās the easiest BR I ground attacker that the devs can add from war thunder but it can be replaced by SB 2M-100A.
Also solid BR I choice. Or Hampden TB Mk I:
IF we go out of war thunder there is even more options Kharkiv KhAI-5: