I see following two step approach:
First you will need a hebrew font for the display. If not already available - you have to create your own.
Not complicated, just time consuming.
The second step is, that you have to map the UTF8 hebrew characters to the stored font.
https://www.utf8-chartable.de/unicode-utf8-table.pl?start=1280
for me it looks like hebrew chararcters start with U+FB1D ... 0xefac9d
so 3 character UTF8.
read the first characters to see if you got 0xefac and map the next received character to your modified font and print to the display.
For shure not easy for a beginner, but doable.