Ah.
That dang thing I have been looking for at least a week at home!
We had several of them and I can't find any!

So I use the kettle for French press coffee from Ikea for tea. It works pretty well.
https://www.ikea.com/cz/cs/p/upphetta-konvice-na-caj-kavu-sklo-nerezavejici-ocel-kremova-80583739/
 

 That's an interesting option. The only issue I have with that is yes another thing to wash up. 

 True. But it is surprisingly easy. Just pour a water from tap and it's clear.
No issue there. At least not for the tea I'm currently drinking. 

 I just think that it would take up limited cupboard space that is better used for other things, too. I'm also very lazy with washing dishes. 😅