There isn’t a way to make the bot use the skill directly.
You could make a scenario that does a small bit of fishing activity, then activates a macro that attempts to use up all your angler’s arts, then takes a break for about 10 seconds (to accomodate the skill being spammed), then goes back to fishing and yada yada. But you’d have to set this up manually. I’m not sure how complicated that would be because I’ve never done a fishing scenario.
If you’re at the PC and just letting Miqo fish for you, you can manually spam the skill every now and then and it won’t cause any issues for the bot.