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I believe it might be difficult to mix the FlexColumn shortcode into the Block Editor work flow. Flex Column is a fairly complex shortcode, and requires significant understanding to use effectively, with options being required in more than one place. If your goal is to build a site for a customer that you want to use the block editor (and that is really a sound strategy these days), using shortcodes of almost any kind is a bit out of the standard Block Editor work flow.
However, there are many plugins that add new blocks to the Block Editor. I have not searched, but it is possible there is a plugin that can build columns based on screen width.
I would suggest scanning the plugin library for a block editor plugin that might do that.