What? Simply create an event with ability for remote triggering in client-side which will call that exported function just the way you wrote above in the first post and call the event in server-side.
Example - Client-side:
addEvent( "onGetPosition", true );
addEventHandler( "onGetPosition", root,
function( szText, var1, var2 )
exports.text:showText( tostring( szText ), tostring( var1 ), tonumber( var2 ) );
end
)
Server-side:
triggerClientEvent( ele, "onGetPosition", ele, "My text", "4000", 20 );