This PowerShell script will list all the definitions from the Azure RBAC role that you put in the -name parameter.

List_All_Definitions_Az_Roles.PS

Get-AzRoleDefinition -name "<Insert-Your-Azure-RBAC-Role>" | `
%{
    $a = $_
   $_.Actions | select `
        @{n="Role";e={$a.Name}},
        @{n="Type";e={"Actions"}},
        @{n="Definition";e={$_}}
   $_.DataActions | select `
        @{n="Role";e={$a.Name}},
        @{n="Type";e={"DataActions"}},
        @{n="Definition";e={$_}}
   $_.NotActions | select `
        @{n="Role";e={$a.Name}},
        @{n="Type";e={"NotActions"}},
        @{n="Definition";e={$_}}
   $_.NotDataActions | select `
        @{n="Role";e={$a.Name}},
        @{n="Type";e={"NotDataActions"}},
        @{n="Definition";e={$_}}
}