How to manage Spatie Media Library Custom Properties

[buoyant fractal]

I'm in need to give the option to users in my panel to edit an alt and title fields to an uploaded image. I tried to load and set custom properties through child components and other methods but nothing worked so far.
I could try to use a pivot model to store those values but it seems redudant, anyone managed to find a solution ?

[wraith ocean]

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[formal gull]

I'm having the same issue.