Version 1.5.3 adds webfonts back into Dicier with both .woff and .woff2 files. It also includes a small section in the User Guide looking at the CSS code you'll need, though you'll wanna check out actual CSS tutorials too if you're not confident with the language already.

The .otf files have also been re-exported from a newer version of the font design app that shouldn't be creating faulty metrics as happened in v1.5.2 and v1.5.2b (this was a minor bug for Dicier, but in any case, now it should be fixed).