Not me. Other than that arska controlmyspa Python library I only found the controlmyspa-ha-mqtt solution from mikakoivisto for the ControlMySpa (CMS) Cloud Service which personally also did not get to work so now given up on as too complicated and an integration not working locally would really be last resort for me anyway (as require controlmyspa.com cloud service account and registering with an authorized reseller to get unique store CMS code for them to monitor your setup is IMHO double bad solution).
I have now decided to just place an order for the official bwa™ Wi-Fi Module (50350 / “BWA Link”) from Balboa) instead to be able to use the Balboa Spa Client integration which is supposed to work locally and is a natively embedded integration inside Home Assistant core (so it does not require any cloud service or external ControlMySpa to MQTT bridge project or MQTT broker).
An alternative to buying the official bwa™ Wi-Fi Module (50350 / “BWA Link”) from Balboa is to build your own custom DIY module hardware and use the Balboa Worldwide App gem Ruby library by ccutrer, see → https://community.home-assistant.io/t/balboa-hot-tub-spa-automation-and-power-savings/353032 and https://github.com/ccutrer/balboa_worldwide_app