Can you add a configuration of zombie types and their weight in the horde? You can check my Hotwaves mod, its repository is in my profile. There is already a ready-made solution there.

I would like to kinda expand on bazebro's idea by adding option to change what mobs spawn in those waves. Also would be cool if you would post it on curseforge

That is already possible. With the current version you can enable/disable certain zombies and you can set a chance how likely it is that they spawn.
e.g. per default:

• Demolition Zombies are enabled and have a 6% chance to spawn
• Elite Zombies are also enabled and have a 3% chance to spawn

Post what on Curseforge?

He might be asking about adding custom mobs that can have a start and end day set. Like this configuration
"waveMobs": [{
"mobId": "minecraft:zombie", //mob type
"count": 10, //base count
"minDay": 0, //initial spawn day
"maxDay": -1, //last spawn day, if -1 then the mob will be in every wave
"strength": "LOW" //mob weight for balance the count
},
{
"mobId": "mutantmonsters:mutant_zombie",
"count": 10,
"minDay": 0,
"maxDay": -1,
"strength": "HIGH"
}
]

Thanks for the suggestion, I will have a look :)

how to open config menu plz help

hola muy buenas tardes. como se abre la configuracion en forge o como se configura?

@BazeBro1337 and @R4llik
Please see the first beta release 1.0.0-beta1 for Forge 1.20.1 (more releases will follow soon).
It's now possible to add your own mobIDs :)

The wiki page explains how to use the new system with a separate config for the horde waves:
https://github.com/MC-Mods-Pete/UndeadNights/wiki

I released version 1.0.1 today (includes the new config system)

@MC-Mods-Pete Bro thank you so much