The template node and ui-form should be all you need.
e.g.
[{"id":"5b49c64f6c756c55","type":"ui_form","z":"e5aae51cd3f577c7","name":"","label":"","group":"2d4fe667.28f8ba","order":15,"width":0,"height":0,"options":[{"label":"var1","value":"var1","type":"text","required":true,"rows":null},{"label":"var2","value":"var2","type":"text","required":true,"rows":null}],"formValue":{"var1":"","var2":""},"payload":"","submit":"submit","cancel":"cancel","topic":"topic","topicType":"msg","splitLayout":"","className":"","x":210,"y":160,"wires":[["cd40f40eaacf5518"]]},{"id":"cd40f40eaacf5518","type":"template","z":"e5aae51cd3f577c7","name":"","field":"payload","fieldType":"msg","format":"handlebars","syntax":"mustache","template":"1=^XA^CI0 2=^FO100,25,0^BY12^BXN,7,200,20,20,1,_^FD{{{payload.var1}}}^FS 3=^FT300,110^CI0^A0N,42,45^FD{{{payload.var2}}}^FS 4=^XZ","output":"str","x":380,"y":160,"wires":[["890e368018dea777"]]},{"id":"890e368018dea777","type":"debug","z":"e5aae51cd3f577c7","name":"debug 12","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","statusVal":"","statusType":"auto","x":560,"y":160,"wires":[]},{"id":"2d4fe667.28f8ba","type":"ui_group","name":"demo","tab":"1caa8458.b17814","order":2,"disp":true,"width":"18","collapse":false,"className":""},{"id":"1caa8458.b17814","type":"ui_tab","name":"Demo","icon":"dashboard","order":2,"disabled":false,"hidden":false}]
