But, you can try - if it’s a specialist company (ie a flooring co) installing the floor, ask them & see what they say. Some companies will give it a go. For example, when my kitchen was installed, the company zero rated a few things, like the oven. No, it wasn’t designed for the disabled, but it was chosen and installed in such a place that I could use it. (I can’t anymore, but this was 12 years ago!). Actually my wet room flooring was zero rated too - from a different company.
So it depends on the company. If they stick rigidly to the letter of the law/government guidance, then they’ll say no. But if prepared to give it a go, they’ll say yes. After all, it costs them nothing.
If the answer is yes, they’d either have a standard form or there’s somewhere I found a form (can’t remember where now, but it can’t be hard to find if I found it!)