The base is original from the producer (chords and melodies), but is complemented with elements that complement the song that come from samplepacks, usually, vocal chops, guitars, wobbles sections, glitch effects. It is the standard in which most of producers work, in a project you will find MIDI files made by the producer, but also melodic loops.
Used the harmonic progression of the vocal to create the track.
Sample pack Dropgun Samples - Vocal EDM Trap
Loop name DS_VEDMT_150_synth_strings_melody_loop_owly_Emin