Our dm has granted each party member a gift from the gods.

My gift was an additional spell slot per spell level, and an additional prepared spell per spell level.

I can't seem to find any way to modify these in the homebrew feats. I've also asked google gemini and it's said that there isn't any standard option to do this, but it has a number of convoluted work arounds. 

Just checking if anyone knows if this is possible, and if so, how to go about implementing this for my character.

Cheers

Cannot alter spell slots.

You cannot increase spell prepared limit normally but there is a way. To add more prepared spells you would need to make a copy of the species or subclass and add the feature there. Add spell and ensure Counts as Known is no, counts as prepared is no (because this is referencing your maximum normal limit of preparations, by selecting no it means it doesn't count against your normal maximum), and Uses Spell Slot as Yes. You can either check "is infinite" and just be done, trusting the user to keep to the limits or you need to create a new feature for each level they would be able to add a new prepared spell.