Convert SVG to PDF by PDFLib using PANTONE colors which are not reflecting in PDF?

Question

I'm generating PDF by SVG using PDFLib library, and it's working as expected but not reflecting the pantone colors which was added in SVG with the syntax:

SVG SAMPLE PATH

<path id="path18" style="fill:#1f2b5d icc-named-color(ignore, 'PANTONE 2757 CP'); fill-opacity:1;fill-rule:nonzero;stroke:none" d="m 3269.67,2845.93 c 200.32,-200.33 525.12,-200.33 725.45,0 l -725.45,725.45 c -200.33,-200.32 -200.33,-525.12 0,-725.45" />

<path id="path20" style="fill:#bd903e icc-named-color(cmyk, 'PANTONE 4026 C');fill-opacity:1;fill-rule:nonzero;stroke:none" d="m 981.129,2845.93 c -200.332,-200.33 -525.133,-200.33 -725.449,0 l 725.449,725.45 c 200.331,-200.32 200.331,-525.12 0,-725.45" />

Using pdfLib.load_graphics("auto", sourcePath, ""); this function to read SVG and convert it into PDF.

Expected output should include PANTONE colors on generated PDF.