VLANs, but with the router integrated WiFi

Hi, so I'll try to make more clear what I'm trying to achive.
I want to isolate my IoT devices and they are all connected with WiFi. Now, if I were using an external AP connected to one of the ethernet ports I would just set up the VLANs, but in this case I'm using the integrated WiFi, so that's really not possible. My question then is if it's possible to achieve a similar setup as I would with an external AP and VLANs but with the integrated WiFi.
My first thought was to set up a Guest WiFi, but that's not really the same thing.
Another idea was to setup a Guest WiFi, but this time attaching to the interface an empty bridge device, tho, I'm not sure that's correct.
So I'd like to know what's the "best" way to achieve what I'm trying to do, or in case what I'm trying to do is dumb, what I should do instead. Thanks.

Are you working with an OpenWrt router? If yes, you don't need to use external APs to achieve your goals -- you can setup multiple SSIDs, each mapped to their own subnet.

https://openwrt.org/docs/guide-user/network/wifi/guestwifi/configuration_webinterface

What is the output of:

ubus call system board
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It is exactly guest wifi. Just another, not one you print qr code at the door.

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Yes, it's an OpenWrt router. If making a guest wifi is what I'm looking for than I have no issues with it as I already made one. Thanks.

Alright, that's what I wanted to know. Thought I had to follow a more complicated method. Thanks.

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