Impressive project, judging by commits and features, it's clear that significant effort has been poured into this :)
Unfortunately, there's no specific MacOS installation method provided, unsure if buildable from source ?
In the meantime, you can deploy the software from AWS Marketplace[2] and use it through your web browser but note that this is an on-demand paying product.
[1]: https://gitlab.com/squey/squey/-/tree/main/buildstream/eleme...
[2]: https://aws.amazon.com/marketplace/pp/prodview-l363lrih42bhm
Feel free to open an issue[1] on the project repository to further discuss about a MacOS port :)