I transcribed and added chords to "🎵 Coffee" (composed by TK)

I have transcribed the melody from this article into sheet music.
The key you are singing in is "E♭," but since I think that might be hard to follow,
I have also prepared it in the Key of C.

Now, regarding the chord progression,
I'll say this upfront: although I also release my own music,
I rarely write songs by thinking about the chord progression first.
I believe that theory and chords are things that come after the fact.
You can make a song just by adding notes based on the sounds you hear in your ears.
There is no need to overthink it.
(So, if I were to name my chords, it would be a disaster. 🍵.)
In the first place, there are infinite chord progressions, so any of them are just "what happened as a result."

This time, since it gets confusing to place notes when working in E♭,
I thought about the harmonies in the key of F, which is one step higher.

First, if you think about it logically starting from the melody, it looks like this.
(The beginning is a repetition of Dm7 and Gm7onC.)

But this feels a bit lonely, and I don't think it matches TK's intention.
So, I used what's called a "Ride on Time progression" to make it sound cleaner.
(Dm7 has been changed to B♭maj7.)
Before the ending, I also used a chord that is rarely used, called Em7♭5.
(Hey! That's a "radical modification" already!)
I simply intended it to be an Em7, but since it's in the key of F, it's just what happened as a result.

And finally, as a bonus, this is the one closest to the sound I felt.
It's almost the same as the one above, but the ending has a sus4 (the "Amen" sound of church music) harmony.

Since it seems you want to make this a ukulele song, I think the sheet music in the key of C would be the most helpful, right?
How about something like this?

See you later.

May good things happen to everyone.