You can't apply a flair (or tag) when posting from Lemmy, right?

Like combining Flair-or-tag-Text with some formatting? (I thought I saw that once, maybe it was in an app?)

For flairs a possible workaround could be to encourage Lemmy posters in PieFed-Communities to include info what flair they'd want. Mods then could add them (or add them on a regular base, and communicate that). For tags there's probably no better workaround than adding #s to the body, so that they can be found via community searchbar.

IIRC Lemmy 1.0 will bring some changes in that regard, so compatibility should increase.