Custom selection appearance from Rectangle to Circle (actualBounds)

At our project, it have the specific requirement: make the bound when selected is Circle.

The default actualBounds:

Our expected requirement:


Are actualBounds can be modified from Rectangle to Circle?

There are several possibilities that are described at GoJS Selection -- Northwoods Software

Thank you @walter, we will check that.

@walter We have read about Selection.

We add the Selection Adornment to our PlaceHolder, we have the issue coming up (with attachment):

How can we adjust the Adornment to fit the Placeholder inside and keep the Text?

Set Shape properties:

{ spot1: go.Spot.TopLeft, spot2: go.Spot.BottomRight }

or use slightly different Spots, as desired. Shape | GoJS API

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Thank you @walter very much