FontForge
lastmod 2023-04-24created 2023-03-085 edits
FontForge (called PfaEdit until March 2004) is a full-featured font editor that supports all common font formats. Developed under the lead of George Williams, FontForge is free software distributed under the 3-clause BSD license. The program is available for several operating systems, including Linux, Windows, and Mac OS X, and has been translated into 12 languages.
Install
You can get it as an AppImage from the github release page.
Find Unicode
To search for U+1d11e, open the font file and check with View -> GoTo (Ctrl + Shift + >).