Retrofit underfloor heating in the bathroom during renovation

Question about renovation
We have a boiler from Viessmann, and there are radiators throughout the entire terraced house. The boiler was newly installed 3 years ago. The rest of the system dates from 1995. On each floor, there is a distributor for the radiators.
We are planning to renovate the bathroom soon. Now we are wondering whether it is possible to connect underfloor heating to the existing heating circuit if we remove the screed.
What additional information is needed to make a statement about this?

I'll say a general "yes" - we've had it like that so far, meaning:

- Gas heating
- radiators everywhere
- additionally underfloor heating in the bathroom and the conservatory

I wouldn't know what could speak against it...

However, I would still have a radiator installed in the bathroom...

Soon we plan to remodel the bathroom. Now we are wondering if it is possible to connect underfloor heating to the existing heating circuit when we remove the screed.

Yes. But not simply connect the pipes to the existing heating circuit. Then you will have temperatures that are far too high in the underfloor heating in the bathroom.
I would keep a wall-mounted radiator as a towel radiator and connect the underfloor heating with an RTL.

P.S. RTL means return temperature limiter