My ruling? If you can safely make it up, you can safely make it down.
Jumping and fall damage is apprently contencious on the Internet.
https://rpg.stackexchange.com/questions/57271/do-you-take-falling-damage-after-a-high-jump-of-over-10-feet
The concept of a high jump doesn't consider total distance travelled, just the distance you jumped... that ambiguity is enough for me to justify no fall damage if you jumped.
Now there's a different between jumping, dropping, and falling -- the good, the bad, and the ugly so to speak. Jumping is an attempt to increase your elevation (with control), Dropping is an attempt to decrease your elevation (with control), and falling is decreasing your elevation (without control). Intention aside, when people jump from a balcony or building, they are really dropping from that distance -- not jumping (if their intentions don't involve self-preservation, then they are falling).
Here's some logic as to why I'd rule if you can jump X feet that you can probably land safely with the same distance.
We don't have a good real world analogy here. As of 2016, the world record for a vertical jump is 63.5 inches (~5.3 feet). Using 5e's vertical jump rules, this person would have 24 STR (+7 modifier) to make it 5 feet in the air or 26 STR (+8 modifier) to make it 6 feet.
I think the best analogy is what a long jump could do. The world record is 29'-4.25". Again, in the 5e world... you can jump up to your STR score but you need to move at least 10 feet to so. With a 30 foot long jump, it would require 30 STR + 40 available movement speed. Sematics aside, the person who jumped 30' didn't get hurt. Now if that same person were to be thrown the same distance (using the same speed and distance), they'd be massively hurt. The point is, if you have control while doing the action, you're able to keep yourself safe during the action.. if you can't keep control, it's a different story.
A standing vertical jump to a platform.
https://www.hoopsbeast.com/the-highest-vertical-jump-record/
Now from a practical sense about high jumping, a high jump is primarily focused on how high you can get with little to no regard for landing. Since people aren't capable of jumping 10 feet in the air, we need to think about other scenarios where people have travelled 10+ feet and seen how they fare. Most reasonably fit, light-ish (150 lbs), people can jump down 20 feet (specific wording here because they aren't intending to jump up 10 feet, then fall 30.. they are "dropping" 20 feet with the intent to land safely) and suffer no injuries -- it's mostly repeatable, I'm sure fatigue would lead to mistakes and those mistakes would eventually hurt the person.
In the real world, it's entirely possible to die falling from zero feet (it happens all the time).
https://www.quora.com/How-likely-would-I-be-to-survive-a-jump-out-a-window-of-my-second-story-apartment
Landing under an "old-style" round parachute (e.g., T-10) is roughly equivalent to the impact of jumping from a second-story window... and military airborne troops have been successfully doing this since World War I.
It's entirely possible the Monk's Slow Fall exists for a reason (and we all know monks can use all of the favorable ruling they can get), so maybe those high jumpers should take falling damage:
Slow Fall
Beginning at 4th level, you can use your reaction when you fall to reduce any falling damage you take by an amount equal to five times your monk level.
Practicallity in 5e:
https://rpg.stackexchange.com/questions/57283/does-the-jump-spell-stack-with-the-monks-step-of-the-wind-ki-ability https://www.enworld.org/threads/jump.362742/#ixzz3SirpzT8U
Jumping costs your movement speed, so you are possibly constrained by that. If you can only move 30 feet but you can jump 90 feet, you can only jump 30 feet.
But you're nerfing Slow Fall (the spell) with this rule!
This is a separate issue because if the situation arose where the fighter, barbarian, monk, or someone else in the party was like "I can jump that far but it will kill me" and the sorcercer says "No, it won't -- I can cast Slow Fall." Guess what's going to happen? The sorcerer is going to get a point of Inspiration.