In The Unicode Standard, Kayah Li script implementation is discussed in  Chapter 16 Southeast Asia.

The Kayah Li script was encoded in The Unicode Standard version 5.1. The script is encoded in the following block:

BlocksCharacter RangeAdded in Unicode VersionUnicode Chart
Kayah Li A900..A92F 5.1  UA900

A number of proposals for its inclusion have been submitted to the Unicode Technical Committee and WG2:

1999-09-06 Kayah Li - proposed code table — Michael Everson ( L2/99-268)

2006-01-11 Preliminary proposal for encoding the Kayah Li script in the BMP of the UCS — Michael Everson ( WG2 N3024,  L2/06-004)

2006-03-09 Proposal for encoding the Kayah Li script in the BMP of the UCS — Michael Everson ( WG2 N3038,  L2/06-073)

2008-03-02 Criteria for the encoding of script-specific dandas — Unicode and US National Body ( WG2 N3457,  L2/08-118)

2013-06-26 Proposal to Change Script and Script_Extensions properties for U+A92E — Lorna Evans ( L2/13-137)