I'm able to disable the build failure analyzer plugin for my scripted Pipeline by using:

   properties([[$class: 'ScannerJobProperty', doNotScan: true]])

as per: https://github.com/rkivisto/buildFailureAnalyzer/blob/master/Jenkinsfile

For declarative Pipeline:

https://github.com/rkivisto/buildFailureAnalyzer/blob/declarative/Jenkinsfile

the BFA plugin is working well, but when I searched the documentation for the BFA plugin, and also when I check the Declarative Directive Generator (https://jenkins.io/blog/2018/04/09/whats-in-declarative/#declarative-directive-generator) under the "Options" directive, I do not see any options related to disabling the BFA plugin for declarative pipeline.