What components do I need to display an analog DC current value on a 7-segment display array?
If you're not familiar with electronics or with writing software, probably it's better (and certainly easier) to source a pre-made panel meter that measures voltage. These are available from the usual places - Mouser, Digi-Key, etc. It includes the ADC and converts a voltage input to a readout.

Here's an example of a voltage-input panel meter: https://www.mouser.com/datasheet/2/281/Murata_05032019_dms01-vp-rs12-c_3-20-19-1591455.pdf

The Hall sensor can be connected directly to this meter, which can be set up for the gain required (span) to get the appropriate amperage readout.

There are also Arduino projects that integrate a display and use the chip’s ADC to read a voltage from a current sensor and display it. Here’s an example: https://www.electronicshub.org/interfacing-acs712-current-sensor-with-arduino/