Don't just send 4 its dominant — send its whole ii–V. The borrowed 5- (minor!) is 2- of the 4 chord's world, and 1⁷ is its 5⁷. Jazz standards run on these two-chord modules.
hear it in “Misty” bars 3–4 — ii–V into the 4
Lead-in — how players set it up1Δ7 first; the 5- minor is the 'we're going somewhere' flag.From 2-⁷ — parallel minor 7ths sliding down a whole step.Or from plain 4, retro-lighting it with its own ii–V.Follow — where it usually goes4Δ7 can drift home or darken to 4- for the backdoor.Chain modules: 4Δ7's world hands to the ii–V of 5.Or sour the landing — 4- and take the backdoor home.
Over 5-⁷ to 1⁷, the melody flat-sevens early: b7 arrives as a color, becomes 1⁷'s blue note, then falls into 4's 3rd.Target tones (in C)Gm7 — lean on Bb (b3) · F (b7)C7 — lean on E (3) · Bb (b7)Fmaj7 — lean on A (3) · E (7)Half-step wiresF ↘ E · E → F · Bb ↘ A