No, the Google Play Store is not available on Chrome OS Flex.
Here’s a clear, informative text you can use for a blog, guide, or help article on installing the Play Store on Chrome OS Flex: chrome os flex play store install
Unlike standard Chrome OS (found on Chromebooks), Chrome OS Flex is designed for older PCs and Macs. To keep the system lightweight, secure, and compatible with a wide range of hardware, Google does not include Android app support in Chrome OS Flex. No, the Google Play Store is not available on Chrome OS Flex
