Spell checker for multiple languages (with custom dictionary from Anytype)

My location is in Germany and AnyTwo's spell checker works for the German language. --> Good.

But in Anytype, I was also able to use the English spell checker in addition, what I miss in AnyTwo -- if I write in English, my words become red underlined.

Also, I miss my Custom Dictionary that I have in Anytype.
It's full of the special words that I always need.
It would be nice if I could simply transfer it to AnyTwo.