Raspberry Pi Hotspot

[livid vapor]

No. HAOS doesn't support that. You might be able to do it with an HA Container install (docker), but you lose addons and some other features.

[earnest tartan]

There are WiFi-Access Point add-ons available for HAOS. If that's what you mean with hotspot.

Like this one:
https://github.com/mattlongman/Hassio-Access-Point