Yes, but it doesn't work for all ebooks. Probably they have some kind of protection. Currently i have this style, but it doesn't work for all ebooks:
Code:
body, html, div {
text-align: justify !important;
hyphens: auto;
font-family: "DejaVu Sans", serif !important;
}
And if i try the ebook that won't work in Calibre on Foliate, with enabled option for overwriting default font, overwriting the font in Foliate works.