As in using one command to print out "tränenüberströmt" for example? No.
There are two fixed width fonts that have extra characters beyond "Basic Latin",
these are 17 and 19 and the same size regular sets are the fonts 16 and 18.
But you can not use fonts 17 and 19 directly, so this:
EVE_cmd_text_burst(10, 390, 18, 0, "tr nen berstr mt");
EVE_cmd_text_burst(10, 390, 19, 0, " ä ü ö");
Does not work, the fonts only use values from 0...127 and the symbols need to translated from the table
to the correct numbers - see "Table 4-10 ROM Font Extended ASCII Characters" in the datasheet.
I just tried to print out a couple of chars and now I wonder how the first symbol with "Decimal" 128 is supposed to be useable,
as this one translates to zero printing that with CMD_TEXT should fail.
This works:
const char text[] = {127, 127, 4, 127, 127, 127, 1, 127, 127, 127, 127, 127, 127, 20, 0};
EVE_cmd_text_burst(10, 390, 18, 0, "tr nen berstr mt");
EVE_cmd_text_burst(10, 390, 19, 0, text);
But this is not only cumbersome to use, this is rather difficult to read on the 5" with 800x480 I am using.
And 18/19 already is the larger font pair.
I normally stick to fonts 26 to 31.
My recommendation is to use converted UTF-8 fonts with BT81x.
I am using this charmap to only convert a subset from "Basic Latin" and "Latin-1 Supplement":
!"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~©«°±²³´µ¹»¼½¾ÄÖ×Üßäëö÷øü
What I also did back when I "only" had FT813 was to cheat, printed a "o" with a smaller font to a fixed position for "°C".
And I printed an "i" over an "u" to get a "µ", a few pixels low of course.
The third option would be to use images for labels.
I used an image for the text "Prüfplatz" in one project.
New points for the wishlist for the next generation of EVE chips

:
- remove fonts 16 to 25 and put in UTF-8 versions of fonts 26 to 34 with "Latin-1 Supplement"
- vector fonts, perhaps with a command to convert a set of glyphs before using it, so like a font-cache