const number = (await api.rpc.chain.getHeader()).number.toNumber()
await api.rpc('dev_setStorage', {
 scheduler: {
   agenda: [
     [
       [number + 1], [
         {
           call: {
             Inline: '0x0508006d6f646c70792f7472737279000000000000000000000000000000000000000000'
           },
           origin: {
             origins: 'BigSpender'
           }
         }
       ]
     ]
   ]
 }
})
await api.rpc('dev_newBlock')