How to round corners in Nodes

I want to round the two corners highlighted in red.

This is what I am attempting to do:
TEST gIFT cARD.lbrn2 (77.4 KB)

You can use the radius tool to accomplish this.

More information here:
Modifier Tools - LightBurn Software Documentation

However, it looks like the bottom line in the screenshot may be a curve instead of an actual line which will cause a problem. If so, convert the curve to a line before using the radius tool. One way is to use the Node Edit tool, select the shape, hover over the curve, and then push ā€˜Lā€™ key.