I'm creating a fillable pdf and I need to make a box for signature section so my client are able to sign when I send the PDF to them. No access to Signature line

Help. I’m creating a fillable pdf and I need to make a box for signature section so my client are able to sign when I send the PDF to them. No access to Signature line. Thinking of making a way to upload a picture of that signature instead. I’m using Libreoffice text document. Is it possible?

Can the PDF reader softwares insert images into a PDF file???
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Try to use the hydride PDF format: that file format can store the PDF version of the document for the PDF readers, and it can store the ODF version of the document for the LibreOffice - in same file.

In addition to @Zizi64 :

What is a hybrid PDF file?