How to set hash type for single dnsbl (querying more than one dnsbl that use different hash type)

[Edobeta]

Hi,
this plugin works great in Spamassassin.
Just a question about how to set different hash type for different dnsbl.

For example this is in my current local.cf (apart for non-existent dnsbl addresses invented for this example), where both the dnsbl using sha1, this works great for me.

ifplugin Mail::SpamAssassin::Plugin::AttachHash

attach_hash_type sha1

# first dnsbl
attachhashdnsbl   EXMPLE1_ATTACHHASH     ex1.justfor.exmple.
body              EXMPLE1_ATTACHHASH     eval:check_attachhash('EXMPLE1_ATTACHHASH')
describe          EXMPLE1_ATTACHHASH     attached file hash classified as malware by exmaple1 dnsbl
priority          EXMPLE1_ATTACHHASH     -100 # required priority to launch async lookups early
tflags            EXMPLE1_ATTACHHASH     net
score             EXMPLE1_ATTACHHASH     2.5
# second dnsbl
attachhashdnsbl   EXMPLE2_ATTACHHASH     ex2.justfor.anotherexmple.
body              EXMPLE2_ATTACHHASH     eval:check_attachhash('EXMPLE2_ATTACHHASH')
describe          EXMPLE2_ATTACHHASH     attached file hash classified as malware by exmaple2 dnsbl
priority          EXMPLE2_ATTACHHASH     -100 # required priority to launch async lookups early
tflags            EXMPLE2_ATTACHHASH     net
score             EXMPLE2_ATTACHHASH     1.5 

endif

But what if the first or second dnsbl require md5?
How to specify per-dnsbl hash algorithm?
A way like this (but doesn't work currently):

attach_hash_type      EXMPLE1_ATTACHHASH     sha1 
.
.
.
attach_hash_type      EXMPLE2_ATTACHHASH     md5 

Best regards
Luca