Скачать или смотреть How to summon custom item mobs in Minecraft 1.17.1+?

/summon zombie ~ ~ ~ {Motion:[0.2d,1.0d,0.0d],Passengers:[{id:skeleton,HandItems:[{id:iron_sword,Count:1b},{id:lava_bucket,Count:1b}]}],HandItems:[{id:iron_sword,Count:1b},{id:bow,Count:1b}],FallFlying:1,ArmorItems:[{id:iron_boots,Count:1b},{id:leather_leggings,Count:1b},{id:elytra,Count:5b},{id:netherite_helmet,Count:1b}]}


/summon zombie ~ ~ ~ {Passengers:[{id:skeleton,HandItems:[{id:iron_sword,Count:1b},{id:lava_bucket,Count:1b}]}],HandItems:[{id:iron_sword,Count:1b},{id:bow,Count:1b}],FallFlying:1,ArmorItems:[{id:iron_boots,Count:1b},{id:leather_leggings,Count:1b},{id:elytra,Count:5b},{id:netherite_helmet,Count:1b}]}

Type data get entity {entitytag}
then you will get all the custom things you can do