Hello,
You can use FormattedText to achieve this.
Please refer to the Use formatted text and sample code below:
<HorizontalStackLayout>
<Entry Placeholder="please enter data here"/>
<Label>
<Label.FormattedText>
<FormattedString>
<Span Text="Enter Data "/>
<Span Text="*" TextColor="Red"/>
</FormattedString>
</Label.FormattedText>
</Label>
</HorizontalStackLayout>
Best Regards,
Alec Liu.
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