I have made a button for Hebrew and a button for Greek in the text editor.
Notice that [gr] works for Greek and [he] works for Hebrew.
[gr]ἀγάπη[/gr] will yield ἀγάπη and [he]שָׁלוֹם[/he] will yield שָׁלוֹם.
Also, to simply put something in SBL BibLit font, use [sbl]. This will work for symbols like 𝔊 for the Septuagint, ℌ for the Hebrew Bible, 𝔐 for the Masoretic Text (or Majority Text in NT scholarship), et cetera.
DO NOT put spaces between your tags and the words that they are surrounding.