Is it possible to chain array.push() in Javascript?

You're looking for the (vanilla) JavaScript method Array.concat().

Returns a new array comprised of this array joined with other array(s) and/or value(s).

Example, following your code:

chatCenterMembers = chatCenterMembers
    .concat(activeMembers)
    .concat(noactiveMsg)
    .concat(noactiveNomsg);

chatCenterMembers.push(activeMembers,noactiveMsg,noactiveNomsg)

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