I am not used to jazz, so I don't know exactly what "chord melody" means. If this is playing chords melodically, kind of scales made of chord notes (also known as arpeggios), it is really not so common in CG methods, but there are some of them. The one I remember with lots of that sort of "melodic arpeggios" is Isaias Savio "Modern School of Guitar" book 2, Technique of Mechanism. There are some studies using that kind of arpeggios, like Villa-Lobos number 2. Scales and those exercises are good to work several things at the same time, but I prefer working each specific mechanism individually first. I prefer Carlevaro book 3 exercises on hand positioning and jumps first.
To prepare for quick chords changes, I prefer independence exercises and scales in thirds and sixths, which you find at Savio's book or Giuliani Op1 and several others (like Pujol etc.). Pujol "La Escuela Razonada de la Guitarra", book 4, also has several exercises on chord changes, with 3 or 4 fingers, but I prefer working his exercises on independence first, as you find in his sequence (like famous "spider" exercise from Pumping Nylon, which is in Pujol book 4 too).
When talking about "the rest" of exercises, I think there are by far more exercises than scales or arpeggios. There are specific exercises to finger independence, jumps, hand position changes, slurs, ornaments, vibrato, tremolo, rasgueos, harmonics etc.