First of all, as shown in the figure below, to mark the part circled in pink as a reference, you can position the mouse in front of the full stop of this sentence.

2. Enter brackets and numbers in English, where the numbers represent which citation this article is, and the format is as follows:

Third, select the brackets and the numbers inside, click the right mouse button and click "Font".

4. Click before the superscript in the font dialog box, as shown in the figure below, and then click OK.

The final result of verb (verb abbreviation) reference format is shown in the following figure.