'How to choose between two agents for high-availability in Jenkins pipeline

I have several agents configured in Jenkins.

For one of my pipeline jobs execution, I wish to choose between two of my agents i.e. MYHOST11-ANSIBLE-SLAVE and MYHOST22-ANSIBLE-SLAVE which ever is available. Thus, if MYHOST11-ANSIBLE-SLAVE is unavailable my Jenkins pipeline job should switch to using MYHOST22-ANSIBLE-SLAVE

Can you please suggest what changes do I need in my below pipeline code ?

pipeline {
    agent { 
        node {
            label 'MYHOST11-ANSIBLE-SLAVE' 
        }
    }
    stages {
        stage('Precheck') {
            steps {
                sh "echo Im from Jenkins>/tmp/jenkinsmoht.txt"

Note: I want my pipeline to choose only between the two agents I mentioned as only they have ansible with my pipeline invokes. Other agents don't have ansible thus my pipeline would fail.

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'How to choose between two agents for high-availability in Jenkins pipeline

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