Help understanding DTYP Soft Timestamp

[Marco Filho via Tech-talk <tech-talk at aps.anl.gov>]

Hello all. Today I came across this interesting record:

record(stringin, "$(P)$(R)customTimeTimestampIn") {
    field(DTYP, "Soft Timestamp")
    field(SDIS, "$(CUSTOM_TIMESTAMP) CP MS")
    field(DISV, "-1")
    field(TSEL, "$(CUSTOM_TIMESTAMP).TIME CA")
    field(INP,  "@%s.%f")
}

It's a record meant to get the timestamp from another record via CA.
I had never seen the Soft Timestamp DTYP before. After digging a while I found some e-mails on tech-talk

https://epics.anl.gov/tech-talk/2020/msg01593.php

But couldn't find the documentation on how to use this. Is there any specific link I should look for?

Thanks in advance,

Marco