DNS CAA record response

I am doing things like this:
set rr1 [DNS::rr $name 0 IN TXT “some text here”]
DNS::answer insert $rr1
Now I need to return a CAA record and can’t find a way to format the entry to do this. A CAA record looks like this in a zone file.

mydomain.com.	IN	CAA	0 issue "letsencrypt.org"
mydomain.com.	IN	CAA	0 issuewild ";"

Either this is not possible or there is some way I am not yet aware of to stuff the record into place?
Thank you for any insights.

I have tried several different syntax options but all provide a Error: aFleX compile error
When I don’t get a compile error I get a run time error about too many or not enough arguments.

 set rr2 [DNS::rr $name 300 IN CAA 0 issue "letsencrypt.org"]
 set rr2 [DNS::rr $name 300 IN CAA "0 issue \"letsencrypt.org\""]
 set rr2 {mydomain.com 300 IN CAA 0 issue "letsencrypt.org"}
 set rr2 {mydomain.com 300 IN CAA "0 issue \"letsencrypt.org\""}

All of the above are not getting the record to work.
Aflex 2.0.0
Version: 2.7.2-P16(build: 15)