I am composing a Beamer presentation, and I would like to underline some mathematical entities for emphasis.

I am aware of the ulem package, however for a presentation I would like something more visually pleasing, and I was thinking about a felt-tip marker effect, bold and slightly irregular, along these lines:

Example 1

or also

Example 2

I must be able to underline just parts of a mathematical expression.

Is there any package I can use to achieve such an effect?

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