Can I use a bonus action to ready an action? [on hold]

The 5e rules are a little unclear on this, and I haven’t found anyone who has asked this yet. I’ve been wondering if it is possible to use your bonus action to ready an action. Example: your monk first readies an action to strike as soon as someone comes within range. After the trigger occurs and the readied action is expended, can they then use their bonus action to prepare a dodge, or another attack.