You could do the following to spawn a named entity when you're using the scripting api (Idk if you are):

Create a server script and put for example this in the initialization if you want the villager to spawn when a player attacks another entity:

this.listenForEvent("minecraft:player_attacked_actor") (eventData) => this.summon(eventData))

And this as seperate under everything:

serverSystem.summon = function (eventData) {

const villager = createEntity(entity, minecraft:villager)
const nameable = createComponent(villager, "minecraft:nameable")
nameable.name = "Vilager name";
applyComponentChanges(nameable);

}

And for the custom trades you can use an addon or mod the villager(s) with an editor like Universal Minecraft Editor

is it possible to make the holograms using commands and armor stands like you can on Java?

Posted by: @nikoskon

MINECRAFT BEDROCK COMMAND HELP CENTRE

Hello,
Alot of mc(be) players dont know how to use commands(cmds)/command blocks(cmdbs),so im here to help you with whatever you need

Example

If you are making an adventure map and you need custom things which cannot be done with behaviour packs, or you just dont wanna use one, you can post a reply here and ill do my best to help you! If you need something big, i can join your world and do it myself! (Ign: nikoskon20031)
(Reply with the thing you want)
Thanks,
nikoskon

P.S. The only thing you need for return is to mention me on your project

Hello!

Could you please help me?

I would need many different commands if you don´t mind 🙂

Add me on Xbox Live for later! (You can add me on Pc in the Xbox App, or on the Xbox itself)

NiRa HD

Or Discord: Nik HD#2566

I´m looking forward to hear from you!

@nikoskon is there is any way to give a score or a tag for anyone who rejoin like rejoin detect