In The Unicode Standard, Chakma script implementation is discussed in  Chapter 13 South and Central Asia-II: Other Modern Scripts.

The Chakma script was encoded in The Unicode Standard version 6.1. The script is encoded in the following block:

BlocksCharacter RangeAdded in Unicode VersionUnicode Chart
Chakma 11100..1114F 6.1  U11100.pdf

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

2008-04-08 Preliminary proposal for encoding the Chakma script in the UCS — Michael Everson ( WG2 N3428,  L2/08-133)

2009-08-13 Proposal for encoding the Chakma script in the UCS — Michael Everson, Martin Hosken ( WG2 N3645,  L2/09-187)

2014-02-05 A bag of suggested improvements to Unicode’s provisional Indic properties — Roozbeh Pournader, Behdad Esfahbod ( L2/14-065)

2014-05-08 Improvements requested for Unicode Indic properties (two text file appendices are included) — Roozbeh Pournader ( L2/14-126)

2016-10-28 Request to change the Indic Shaping Property for U+11134 — Andrew Glass, Bivuti Chakma ( L2/16-303)

Recommendations to UTC #149 November 2016 on Script Proposals ( L2/16-342) (See point 5A.)

UTC #149 Minutes ( L2/16-325) (See B.14.2 for decision and action items)

2016-11-02 Proposal to encode CHAKMA LETTER LHAA, DEPENDENT VOWEL SIGNS AA & EI for Chakma — Bivuti Chakma, Andrew Glass ( L2/16-330)

Recommendations to UTC #149 November 2016 on Script Proposals ( L2/16-342) (See point 5B.)

UTC #149 Minutes ( L2/16-325) (See D.13 for decision and action items)